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Strabismus or lazy eye

Lazy eye and strabismus are two childhood eye disorders that are often confused or misunderstood. We explain what they are and how to differentiate them Strabismus is a condition in which one of the child's eyes points in a different direction from the other. It may turn inwards, outwards, upwards, or downwards while the stronger eye looks straight ahead. It is also known as a squint. However, many people erroneously refer to it as a lazy eye People call strabismus a lazy eye because one of the muscles is weak, or lazy. People call amblyopia a lazy eye because one of the eyes cannot see well ( i.e. is lazy) regardless of being outfitted in a great pair of glasses Strabismus. Amblyopia. Slang Term. Crossed eyes. Lazy eye. Definition. Strabismus is a condition in which both eyes do not look at the same place at the same time. It occurs when one or both eyes turn in, out, up or down some or all of the time An eye condition known as strabismus or lazy eye can result in misaligned eyes and vision problems such as eye strain, headaches, decreased vision, or.

Strabismus and Amblyopia are not the same eye / vision condition or medical diagnosis. Lazy Eye is the common or vernacular term for the medical diagnosis named Amblyopia. People sometimes confuse Strabismus with Amblyopia and use the term Lazy Eye interchangably for the two different conditions Strabismus. Most people automatically use the term Lazy Eye when an eye crosses or turns outward. As stated above, an eye that moves on its own is a sign of Amblyopia or Lazy Eye, but Strabismus is the condition that one or both eyes turns inwards (esotropia) or out (exotropia). The affected eyes can stray and move on their own or remain in their position STRABISMUS AND LAZY EYE Lazy Eye Treatment in Columbia. Strabismus is a failure of the two eyes to maintain proper alignment and work together as a team. If you have strabismus, one eye looks directly at the object you are viewing, while the other eye is misaligned inward (esotropia, crossed eyes or cross-eyed), outward (exotropia or wall-eyed), upward (hypertropia) or. Strabismus refers to eye turns inward, outward, up or down. Eye turns can happen all the time, or some of the time. Eye turns can involve one eye or alternative between both. Amblyopia (lazy eye) is a blurry eye due to poor development. It can occur due to a strabismus, but there are many eye turn situations that do not have amblyopia

Put simply, strabismus is a problem with the alignment of the eyes and is informally called crossed eyes. The eyes do not look in the same direction at the same time, as they should. Amblyopia, however, is essentially a problem with a person's eyesight. It's also known as a lazy eye and typically means that they cannot see an image clearly in one (or sometimes both) of their eyes. Strabismus and amblyopia are functional vision problems The lazy eye also referred to as amblyopia, is a condition in which a person's eyesight doesn't develop correctly in either eye as it ought to in either eye. The brain often focuses on one eye much more than the other, almost to the exclusion of the other. This causes the eyes to move about as they should and causes the patient to have difficulty seeing things as they should see

What is what: lazy eye or strabismus? - icrcat

  1. It is sometimes referred to as lazy eye because the wandering eye appears to be lazy. Many people think that strabismus is the result of an eye muscle problem but this is usually not the case.
  2. Strabismus and Amblyopia (Lazy Eye) Strabismus refers to misaligned eyes. If the eyes turn inward (crossed), it is called esotropia. If the eyes turn outward (wall-eyed), it is called exotropia. Or, one eye can be higher than the other which is called hypertropia (for the higher eye) or hypotropia (for the lower eye)
  3. Strabismus is better known as cross-eyed and unlike amblyopia, it affects both eyes. It is primarily defined by a lack of alignment in both eyes which result in them turning up, or sometimes up and sideways. This may occur all the time or intermittently and it is combined with visual acuity problems that require prescription lenses to treat

What is a lazy eye? Amblyopia vs

What is Lazy Eye (Strabismus)? Eye Theor

WHAT IS STRABISMUS AND LAZY EYE? Strabismus is a visible misalignment of the eyes, with one eye turning in, out, up, down, or oblique. Six eye muscles, controlling eye movement, are attached to the outside of each eye. One muscle moves in the eye to the right in each eye, and one muscle moves the eye to the left For decades, many have believed that after a certain age, strabismus or amblyopia (lazy eye) cannot be fixed. While it is challenging, new discoveries and advancements in technology are making it more and more possible to regain eyesight in a weak eye or straighten crossed eyes and it's so exciting Strabismus is a condition in which the eyes do not properly align with each other when looking at an object. The eye that is focused on an object can alternate. The condition may be present occasionally or constantly. If present during a large part of childhood, it may result in amblyopia or lazy eyes and loss of depth perception. If onset is during adulthood, it is more likely to result in.

Lazy left eye exercise #7 - Amblyopia and/or strabismus - Lazy eye and eye turn (squint) - YouTube. Lazy left eye exercise #7 - Amblyopia and/or strabismus - Lazy eye and eye turn (squint) Watch. There are 2 conditions that can trigger a lazy eye: Amblyopia and Strabismus. Amblyopia is a developmental issue that has an eye-brain connection. With Amblyopia, the brain learns to neglect info from the lazy eye, triggering a weak connection between the 2. Strabismus is a misalignment, triggering the eyes to cross when the 6 muscles that surround the eye can't focus and collaborate. For decades, many have believed that after a certain age, strabismus or amblyopia (lazy eye) cannot be fixed. While it is challenging, new discoveries and advancements in technology are making it more and more possible to regain eyesight in a weak eye or straighten crossed eyes and it's so exciting! Even in the last two years since I've begun my If you don't treat it, strabismus can lead to vision damage, including double vision, reduced vision, and amblyopia, also known as lazy eye. Eye Exercises as Therapy Treatment is vision therapy

The medical name for squint is strabismus. It is a condition where the eyes do not look in the same direction. Learn about Squint (Strabismus, or Lazy Eye) in Childre Strabismus, sometimes also incorrectly called lazy eye, is a condition in which the eyes are misaligned. Strabismus usually results in normal vision in the preferred sighting (or fellow) eye (the eye that the person prefers to use), but may cause abnormal vision in the deviating or strabismic eye due to the difference between the images projecting to the brain from the two eyes. [18 Strabismus is when eyes don't line up or when one or both eyes wander. The eyes may turn: When eyes don't line up together, the straight or straighter eye becomes dominant. The vision strength (acuity) of this eye stays normal because the eye and its connection to the brain are working as they should. The misaligned or weaker eye, though, doesn. Get Rid Of Blurred Vision & Improve Your Eyesight With All Natural ReVision®. Order Now Lazy eye: Lazy eye (amblyopia) & strabismus are used interchangeably, having same meaning. Other names are crossed eyes or wandering eyes. Other names are crossed eyes or wandering eyes. 5.5k views Answered >2 years ag

Lazy eye is a term that gets tossed around lightly in regards to ocular misalignment. Both strabismus and amblyopia are considered lazy eye. However, this information is inaccurate. Amblyopia vs. Strabismus. Strabismus, by definition, means ocular misalignment. Ocular misalignment is when both eyes do not look in the same direction, frequently referred to as cross-eye as well. Our eye doctors at Wilmington Family Eye Care in Wilmington, DE excel in prescription of glasses, contact lenses and the diagnosis of a variety of eye diseases. Call our optometrists at 302-299-1286 or schedule an eye exam appointment online if you would like to learn more about strabismus or lazy eye Strabismus refers to eye turns inward, outward, up or down. Eye turns can happen all the time, or some of the time. Eye turns can involve one eye or alternative between both. Amblyopia (lazy eye) is a blurry eye due to poor development. It can occur due to a strabismus, but there are many eye turn situations that do not have amblyopia Alignment/vision: Strabismus is a simple failure of the eyes to line up & focus on the same point.There are several potential causes. Over time this might lead to lazy eye (amblyopia) where the brain decides to turn off the input of one eye if the images don't line up or one is fuzzier than the other For those of you looking for solutions to a lazy eye (technically strabismus) problem, you can look at my personal thoughts on the different options by heading over here. If you are in vision therapy and are looking for tips and tricks for success, you can look at my appointment notes or read about the different exercises that I work on every day. Find me on Instagram @strabismus2stereopsis.

Strabismus vs Amblyopia: The Difference Between Crossed

Strabismus (crossed eye) occurs when both eyes are unable to properly team and align together. As a result, one or both eyes will appear to cross-in or wander-out of alignment. Occurring in 2-4% of the population, strabismus represents a dysfunction in the visual system affecting proper coordination of the two eyes, leading to defective depth perception, defective eye movement control and eye. Strabismus - crossed or turned eye, and Amblyopia, or lazy eye, are not the same condition. Some of the confusion can be because of the fact that strabismus may cause amblyopia. Amblyopia can result from a constant unilateral strabismus, either in the person's left or right eye. Alternating or intermittent strabismus rarely causes amblyopia Amblyopia (lazy eye) Crossed eyes (strabismus) Excessive or unequal astigmatism : Abnormal vision Frequency of Children's Visit to the Ophthalmologist. Divided into two groups: Group 1: Children with abnormalities, such as: Premature infants (with paediatrician recommendation to see an ophthalmologist). Children with mental and developmental abnormalities. Children with other chronic.

Understanding Strabismus and Lazy Eye Wilmington Family

Pseudostrabismus is the false appearance of crossed eyes.When the eyes are actually crossed or not completely aligned with one another it is called strabismus.Pseudostrabismus generally occurs in infants and toddlers whose facial features are not fully developed. The bridge of their nose is wide and flat, creating telecanthus (increased distance between medial canthus of both eyes) Strabismus is more commonly known as being cross-eyes or having a lazy eye. Strabismus is the designation which covers both of these problems, and it is possible to cure these conditions without the use of eyeglasses or contact lenses. To define it thoroughly, strabismus is the condition where both eyes are not able to properly wok together in focusing on an object. In order to clearly see. The treatment goal for strabismus is to allow for normal vision development, realign the eyes, prevent amblyopia (lazy eye), and attempt to restore stereo or 3-dimensional vision. If amblyopia is detected in the first few years of life, treatment is often successful. If diagnosis and treatment is delayed until later, amblyopia (reduced vision in one or both eyes caused by disuse) may become.

Differences. While strabismus is often easy to spot, amblyopia doesn't always present with noticeable symptoms. A person can have amblyopia without a noticeable lazy eye, however, strabismus can usually be seen by the naked eye. Strabismus has to do with the turn of your eye while amblyopia affects the vision in one or both of your eyes In many cases, lazy eye is caused by: (6) Strabismus or crossed eyes; Different vision ability in each eye; Vision problems such as nearsightedness, farsightedness and astigmatism; Damage to an eye from a scar, ulcer, cataract, trauma, surgery or disease (such as glaucoma) Eye patching; A droopy eyelid (also called ptosis) Vitamin A deficiency Risk factors for amblyopia include: (4, 7) A. Strabismus if left untreated may lead to loss of vision in that eye, a condition called amblyopia or lazy eye. Strabismus most often begins in early childhood. Adult strabismus may be the residual childhood strabismus or the condition developed in adulthood. Certain medical conditions such as diabetes, thyroid disease, myasthenia gravis, brain tumor, head trauma, and stroke may increase.

What is Strabismus vs Amblyopia? Treatments: Options

Lazy eye refers to several specific ophthalmic disorders: . Medicine. Amblyopia, a disorder of visual development in which the brain partially or wholly ignores input from one or both eyes; Strabismus, a disorder of ocular alignment in which the eyes aim in different directions; Ptosis (eyelid), drooping or falling of the upper or lower eyelid Art and entertainmen Strabismus (crossed eyes) is a common eye condition among children. It is when the eyes are not lined up properly and they point in different directions (misaligned). One eye may look straight ahead while the other eye turns in, out, up, or down. The misalignment can shift from one eye to the other Amblyopia (lazy eye) is the incomplete development of binocular or two-eyed vision in the brain. The most well-known symptoms of amblyopia are the lack of 3D vision (stereopsis) and reduced visual acuity. Notwithstanding, amblyopes also often have other visual anomalies besides poor stereopsis or reduced visual acuity. May also be continue reading → VisionHelp Podcast: Introduction to. Approximately 2-3 % of children suffer from a condition called strabismus, which is more commonly known as lazy eye or crossed eyes. The majority of cases are thought to involve both genetic. AmblyoPlay® is a vision therapy solution for children with lazy eye, mild strabismus or convergence insufficiency that is performed through playing therapeutic games and exercises every day for 30 minutes. It is perfect for the patient's vision therapy 'homework' that they do at home! ABOUT AMBLYOPLAY. BUY NOW

Video: What is the Difference Between Amblyopia, Lazy Eye, and

Adult strabismus (crossed eyes) is when your eyes are not lined up properly and they point in different directions. One eye may look straight ahead while the other eye turns in, out, up, or down. The misalignment can shift from one eye to the other. Strabismus affects vision, since both eyes must aim at the same spot together to see properly The possible complications of strabismus may include . Lazy eye (amblyopia). It refers to the lack of vision development in one or both eyes. If left untreated, lazy eyes may result in vision loss. Double vision (diplopia). This is commonly seen in older children with acquired strabismus (strabismus occurred in later life). Poor self-esteem. The appearance of the eyes may cause socializing. When the eyes focus too intently, over-convergence can result— causing the eyes to cross inwards. Bifocals for lazy eye and accommodative esotropia. When a child with a lazy eye presents with an eye turn towards the child's nose during near vision tasks, such as reading, accommodative esotropia may be the cause. An eye turn may occur even. Lazy Eye (Defined) Lay term used to refer to amblyopia, strabismus or ptosis. #EyeTerms. Last Updated By: HL Admin 05-09-2018. 0 comments If you have a lazy eye, or strabismus, then you know why this article even exists. If you don't, you might think that we are being dramatic or imagining things, and maybe we are, but imagined or not, meeting someone new when you have strabismus can be very stressful and I'm here to help. I have lived with strabismus for 34 years, and for most of my adult life, my alignment was pretty bad.

Strabismus and Lazy Eye - Drs

Strabismus, eye turns, amblyopia & lazy ey

Approach Each Eye Individually Strabismus occurs when the brain processes spatial information from the two eyes differently. When the brain can't combine the two images into a single 3D image, double vision will occur. This results in confusion and difficulty performing many tasks in daily life. To solve this confusion, the brain needs to learn to suppress (ignore) one of the images or. Amblyopia (Lazy Eye) in Children and Adults. Also known as lazy eye, amblyopia (am-blee-O-pea) occurs when vision in one eye (or both eyes) is impaired because the eye and brain are not working together. Often the eye itself looks normal, but it is not being used normally because the brain is favoring the other eye

lazy eye Suppression amblyopia Ophthalmology Subnormal visual acuity in the non-dominant eye despite appropriate correction of refractive errors, due to an early visual defect/amblyopia-eg, strabismus, farsightedness, myopia, astigmatism, or cataract; with time, the stronger eye dominates and retains good vision; neural connections between the brain and nondominant eye fail to develop. ‣ those with functional amblyopia, resulting from anisometropia (strong difference in visual acuity between the two eyes) or an already corrected strabismus. Lazy eye (amblyopia) is a pathology that prevents or deteriorates vision in 3D (impact on depth and distance perception). The pathology blocks in various degrees the signal sent by the. 1. Made of premium material: Pretty Soft, breathable and Comfortable.skin-friendly. No irritation to children's skin! It can effectively treat lazy eye,amblyopia and strabismus, no light leak. 2. No Light Leak: It made of 8 Light-shielding layers,Completely opaque and no light leak.More effecial to treat Amblyopia. Pa Size:1.6*3.9 Package: 6pcs per pack Reusable, eco-friendly and non adhesive eye patch Hypo-allergenic cloth eye patch Ophthalmologist and Optometrist approved to treat Amblyopia- lazy eye Improved eyesight is possible using Fedorov Restoration Therap

Amblyopia, or lazy eye, is closely related to strabismus. Children learn to suppress double vision so effectively that the deviating eye gradually loses vision. It may be necessary to patch the good eye and wear glasses before treating the strabismus. Amblyopia does not occur when alternate eyes deviate, and adults do not develop amblyopia. Strabismus is often treated by surgically adjusting. Lazy Eye means that the eye sees poorly, even with eyeglasses. Usually when parents see an eye that doesn't seem to line up correctly they think that is a lazy eye. In fact, that is a condition called an eye turn, or Strabismus. It is important for parents to understand that while amblyopia and strabismus often occur together, you won't always see an eye wander off when your child. The eye turn may be constant or only occur intermittently. The eye turn may change from one eye to the other, and may only appear when a person is tired or has done a lot of reading. Strabismus may cause double vision. To avoid seeing double, vision in one eye may be ignored resulting in a lazy eye (also known as amblyopia) Treatment of Amblyopia, Lazy Eye, or Strabismus. Amblyopia is a medical condition that is commonly referred to as lazy eye. A person with amblyopia will have decreased vision in one or both eyes. This is usually caused in infancy or in childhood due to abnormal development in the eye or eyes. Generally, only one eye is affected, but there are rare cases in which both eyes can be harmed. Review question: Treatment of amblyopia (lazy eye) caused by strabismus (squint) with patching or optical treatment (glasses or penalisation) or both. Background: Amblyopia is a common childhood condition which causes a reduction in vision of one or both eyes which is not caused by any eye disease. Amblyopia can be caused by the presence of a squint (misalignment of the eyes where one eye may.

The difference between Strabismus and Amblyopia Optima

Lazy eye & strabismus. A lazy eye or amblyopia is an eye which has not developed as it should during the early childhood years. The result is that, even with corrective lenses, these patients' vision is poor to very poor. There is nothing wrong with the eye itself, but the image that enters the eye is suppressed by the brain Lazy eye means that the eye sees poorly, even with eyeglasses. Usually, when parents see an eye that doesn't seem to line up correctly, they simply think that it is a lazy eye. But in fact, that is a condition called an eye turn, or strabismus. It is important for parents to understand that while amblyopia and strabismus often occur together, you won't always see an eye wander off. Strabismus may affect just one eye or it might altenate, i.e. either one eye or the other deviates. Amblyopia or lazy eye: It develops in children between birth and the age of 8-9, as it is the period when the vision matures and develops. If there is a deviation in one eye, then the child's brain cancels out or disconnects the image of the deviated eye to prevent double vision. As a.

Lazy Eye Treatment With Strabismus Surgery: True Story

Lazy eye or medically termed as The Canadian actor and musician is another celebrity with strabismus. The eye condition gives him a distinctive look. If you look closely at his photographs, you will notice that he is never looking at the exact same spot with both eyes. Taylor Lautner . Best known for playing Jacob Black in The Twilight Saga film series, this American actor. Amblyopia/Strabismus Evaluation. In-depth binocular vision testing for patients with lazy eye or eye-turn. Testing can be performed for all ages, starting from 6 months to adults and seniors. Visual Motor Testing. Ideal for children 3-6 years old, or older patients with developmental disabilities such as Autistic Spectrum Disorder. Vision Therapy. A custom set of eye-brain exercises to prevent. The good eye is patched to encourage the development of good vision in the lazy eye. Amblyopia can be caused by unequal refractive errors, crossed eyes, misaligned eyes (strabismus), or other abnormalities Check out our lazy eye strabismus selection for the very best in unique or custom, handmade pieces from our shops

New Clinical Research Treatment for Amblylopia, StrabismusWhat Is Strabismus?

Strabismus, or Lazy Eye - NBC4 Washingto

Lazy Eye means that the eye sees poorly, even with eyeglasses. Usually when parents see an eye that doesn't seem to line up correctly they think that is a lazy eye. In fact, that is a condition called an eye turn, or Strabismus. It is important for parents to understand that while amblyopia and strabismus often occur together Strabismus can be caused by neurological or anatomical issues that impede the control and function of an eye's extraocular muscles, which regulate eye position and movement, causing both eyes to be misaligned in relation to each another. These issues may stem from the eye muscles themselves, or in the brain's nerves or vision centres that manage binocular vision Strabismus is a misalignment of the eyes, making it impossible for them work together as a team. If you have strabismus, one eye looks directly at the object you are viewing, while the other eye is misaligned inward (esotropia, crossed eyes or cross-eyed), outward (exotropia or wall-eyed), upward (hypertropia) or downward (hypotropia) Lazy eye, or strabismus [], is a condition in which the eyes are not correctly aligned, often because an eye muscle is too weak or too strong, so the eyes may point in different directions.It is common in children, but also can occur in adults, in whom it commonly causes double vision. Typical costs: For patients with health insurance, out-of-pocket costs typically consist of doctor visit. Lazy eye is also used to refer to an eye that does not appear to be pointing where it should; this is formally known as strabismus. Eyes that turn in are called esotropic, eyes that turn out are exotropic. Unfortunately the most common treatment for eye turns, and still the only one offered or accepted by the most of the medical community, is eye muscle surgery or strabismus surgery.

Children with strabismus frequently have an associated condition called amblyopia (lazy eye), although amblyopia can occur without any eye misalignment. Here, one or both eyes have reduced visual acuity. Amblyopia is a problem with the brain's ability to recognize the image from either eye, and is an attempt by the brain to adapt to abnormal input from the eyes. In strabismus, the brain in a. This condition is also called lazy eye or amblyopia. Strabismus or Cross eye is also common in infants and toddlers. Their eyes appear to be misaligned but this is false strabismus or pseudostrasbismus. It is called so because either the nose of the baby is flat around the eyes or the inner corners of the eyes are covered with extra skin. The condition subsides slowly when the size of the face. Doc recommending strabismus surgery. The condition (lazy eye) common in children. Less so in adults. In this case it was diagnosed 3 yrs ago (client is 70) and has progressively become worse. Prism glasses provide temporary relief as long as the glasses are worn. When he takes them off his vision is worse and he gets dizzy. Google search reveals limited information. Strabismus surgery among.

Strabismus and Amblyopia (Lazy Eye) Stony Brook Medicin

If your child's eyes look crossed or misaligned, the problem could be strabismus (misaligned eyes) or amblyopia (lazy eye). Talk to his doctor, who will probably refer you to an ophthalmologist. Fortunately, these conditions can be successfully treated if detected early. Note that it's normal for a newborn baby's eyes to wander or cross now and then, up to about 4 months of age. He's just. Strabismus is the most common cause of amblyopia. To avoid double vision caused by poorly aligned eyes, the brain ignores the visual input from the misaligned eye, leading to amblyopia in that eye (the lazy eye). This type of amblyopia is called strabismic amblyopia Amblyopia - Lazy Eye; Strabismus - Misaligned Eyes; Esotropia (Crossed Eyes, Lazy Eye or Squint) Inferior Oblique Muscle Surgery; Blocked Tear Ducts (Nasolacrimal Duct Obstruction) Computer Vision Syndrome (CVS) Brain Trauma in Children (Pediatric Concussions) Atropine for the Treatment of Near-sightedness (Myopia) in Children ; Retinopathy of Prematurity (ROP) Ophthalmic Plastic Surgery. Lazy eye, or amblyopia, is a common condition that occurs in approximately 3 out of every 100 children.. If the brain favors one eye over the other, lazy eye can result. Usually, this happens when. Besides the visible turning of an eye (the classic indicator of strabismus), adults who suffer from strabismus experience additional symptoms. In children with strabismus, the brain typically learns to ignore visual input from the turned eye, which means children tend to experience less direct visual disturbance (although they may develop amblyopia , also known as lazy eye)

Strabismus surgery, Conjunctival clousure, p 14/56 - YouTube5 Hours after Strabismus Eye Muscle Surgery - YouTube

Amblyopia and Strabismus: What's the Difference - Kraff Ey

Lazy right eye exercise #20 - Amblyopia and/or strabismus

One unpreventable condition that affects some babies is strabismus, also known as lazy eye or crossed eye which is one of the most common eye conditions found in children. Strabismus, causes a baby's eye to be misaligned, with one turned in a different direction. People of any age can also get strabismus, but it's most common in infants. Most people are familiar with crossed. Lazy eye can be caused by any condition that prevents your eye from focusing properly. It can also be caused by your eyes being misaligned, a condition known as strabismus . In strabismus, the eyes cross inward (esotropia) or they can turn outward (exotropia)

Researchers claim that "lazy eye" rewires the brain toWant an eye exercise for lazy eye?

Lazy eye, wandering eye, cast eye, squint, crossed-eye but the medical term is 'strabismus'. The most confusing of all these terms is lazy eye as it is used interchangeably to mean different things. It may refer to 'strabismus', or it may be used to refer to an eye that has 'poor vision' or sometimes when the eyelid 'droops' or appears. Strabismus occurs when the eyes are not aligned properly. One or both of your child's eyes may turn inward (esotropia), outward (exotropia), upward (hypertropia), or downward (hypotropia). Your child can be born with strabismus, or it can be acquired later in life. Strabismus can also develop as the result of an accident or other health problem. In some children, strabismus is intermittent. When an infant or child's eyes are not properly aligned, this is called strabismus (also known as squint). With misalignment, the two eyes do not work together to relay visual information. The brain may suppress the image that comes from the squinting (weaker) eye in order to perceive a single image. When this happens, the weaker eye may develop into a lazy eye. This is a condition known as.