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  2. Refractive error - Wikipedia

    en.wikipedia.org/wiki/Refractive_error

    When refractive errors in children are not treated, the child may be at risk of developing ambylopia, where vision may remain permanently blurry. [33] Because young children typically do not complain of blurry vision, the American Academy of Pediatrics recommends that children have yearly vision screening starting at three years old so that unknown refractive errors or other ophthalmic ...

  3. Myopia - Wikipedia

    en.wikipedia.org/wiki/Myopia

    Other symptoms may include headaches and eye strain. [1] [9] ... Global refractive errors have been estimated to affect 800 million to 2.3 billion. [128]

  4. Astigmatism - Wikipedia

    en.wikipedia.org/wiki/Astigmatism

    People with astigmatism have more difficulty with night driving and can have a decreased productivity due to errors. However, there are many ways to help correct astigmatisms: The use of glasses or contacts, Toric intraocular lenses, Toric implantable Collamer lenses, and/or corneal refractive surgery have been shown to correct astigmatisms. [33]

  5. Visual impairment - Wikipedia

    en.wikipedia.org/wiki/Visual_impairment

    Amblyopia: is a category of vision loss or visual impairment that is caused by factors unrelated to refractive errors or coexisting ocular diseases. [59] Amblyopia is the condition when a child's visual systems fail to mature normally because the child either has been born premature, measles, congenital rubella syndrome, vitamin A deficiency ...

  6. Anisometropia - Wikipedia

    en.wikipedia.org/wiki/Anisometropia

    Anisometropia causes some people to have mild vision problems, or occasionally more serious symptoms like alternating vision or frequent squinting. However, since most people do not show any clear symptoms, the condition usually is found during a routine eye exam. [8] For early detection in preverbal children, photoscreening can be used.

  7. Floater - Wikipedia

    en.wikipedia.org/wiki/Floater

    Each floater can be measured by its size, shape, consistency, refractive index, and motility. [2] They are also called muscae volitantes (Latin for 'flying flies'), or mouches volantes (from the same phrase in French). [4] The vitreous usually starts out transparent, but imperfections may gradually develop as one ages.

  8. Childhood blindness - Wikipedia

    en.wikipedia.org/wiki/Childhood_blindness

    Childhood blindness is an important contribution to the national prevalence of the disability of blindness. [3] Blindness in children can be defined as a visual acuity of <3/60 in the eye with better vision of a child under 16 years of age. [4]

  9. Convergence insufficiency - Wikipedia

    en.wikipedia.org/wiki/Convergence_insufficiency

    The symptoms and signs associated with convergence insufficiency are related to prolonged, visually demanding, near-centered tasks. They may include, but are not limited to, diplopia (double vision), asthenopia (eye strain), transient blurred vision, difficulty sustaining near-visual function, abnormal fatigue, headache, and abnormal postural adaptation, among others.