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  2. Retinal scan - Wikipedia

    en.wikipedia.org/wiki/Retinal_scan

    The network of blood vessels in the retina is not entirely genetically determined and thus even identical twins do not share a similar pattern. Although retinal patterns may be altered in cases of diabetes, glaucoma or retinal degenerative disorders, the retina typically remains unchanged from birth until death.

  3. Retinoscopy - Wikipedia

    en.wikipedia.org/wiki/Retinoscopy

    Static retinoscopy is performed when the patient has relaxed accommodative status. This can be obtained by the patient viewing a distance target or by the use of cycloplegic drugs (where, for example, a child's lack of reliable fixation of the target can lead to fluctuations in accommodation and thus the results obtained).

  4. Eye examination - Wikipedia

    en.wikipedia.org/wiki/Eye_examination

    Retinoscopy is often used in children to measure their refractive errors. [13] This method is a type of objective refraction. It involves the provider shining a narrow beam of light into the eye to see the red reflex of the retina while adjusting differently powered lenses in front of the eye to look for a neutralized point of the reflex. [13]

  5. 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 ...

  6. Ophthalmoscopy - Wikipedia

    en.wikipedia.org/wiki/Ophthalmoscopy

    Ophthalmoscopy, also called funduscopy, is a test that allows a health professional to see inside the fundus of the eye and other structures using an ophthalmoscope (or funduscope).

  7. Visual impairment - Wikipedia

    en.wikipedia.org/wiki/Visual_impairment

    Visual or vision impairment (VI or VIP) is the partial or total inability of visual perception.In the absence of treatment such as corrective eyewear, assistive devices, and medical treatment, visual impairment may cause the individual difficulties with normal daily tasks, including reading and walking. [6]

  8. Glaucoma surgery - Wikipedia

    en.wikipedia.org/wiki/Glaucoma_surgery

    Glaucoma is a group of diseases affecting the optic nerve that results in vision loss and is frequently characterized by raised intraocular pressure (IOP). There are many glaucoma surgeries, and variations or combinations of those surgeries, that facilitate the escape of excess aqueous humor from the eye to lower intraocular pressure, and a few that lower IOP by decreasing the production of ...

  9. Emmetropia - Wikipedia

    en.wikipedia.org/wiki/Emmetropia

    Emmetropia is the state of vision in which a faraway object at infinity is in sharp focus with the ciliary muscle [1] in a relaxed state. That condition of the normal eye is achieved when the refractive power of the cornea and eye lens and the axial length of the eye balance out, which focuses rays exactly on the retina, resulting in perfectly sharp distance vision.