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Xerophthalmia (from Ancient Greek xērós (ξηρός) meaning "dry" and ophthalmos (οφθαλμός) meaning "eye") is a medical condition in which the eye fails to produce tears. It may be caused by vitamin A deficiency, [1] which is sometimes used to describe that condition, although there may be other causes.
Types include esotropia, where the eyes are crossed ("cross eyed"); exotropia, where the eyes diverge ("lazy eyed" or "wall eyed"); and hypertropia or hypotropia where they are vertically misaligned. [3] They can also be classified by whether the problem is present in all directions a person looks (comitant) or varies by direction (incomitant). [3]
Accommodative esotropia (also called refractive esotropia) is an inward turning of the eyes due to efforts of accommodation. It is often seen in patients with moderate amounts of hyperopia . The person with hyperopia, in an attempt to "accommodate" or focus the eyes, converges the eyes as well, as convergence is associated with activation of ...
of or pertaining to the eye's pupil: Greek κόρη (kórē), girl, doll; pupil of the eye corectomy: cord(i)-of or pertaining to the heart (uncommon as a prefix) Latin cor, heart commotio cordis, cornu-applied to describing processes and parts of the body as likened or similar to horns Latin cornū, horn greater cornu: coron-pertaining to the ...
The term derives from Greek ξηρός (xeros) 'dry' and δέρμα (derma) 'skin'. In most cases, dry skin can safely be treated with moisturizers (also called emollients). Xeroderma occurs most commonly on the scalp , lower legs , arms , hands, knuckles , the sides of the abdomen , and thighs .
The cross-cover test, or alternating cover test is usually employed to detect heterophoria. One eye is covered, and then the cover is moved immediately over to the other eye. With heterophoria, when the cover is moved to the other eye, the eye that has just been uncovered can be seen to move from a deviated point.
A common form of exotropia is known as "convergence insufficiency" that responds well to orthoptic vision therapy including exercises. This disorder is characterized by an inability of the eyes to work together when used for near viewing, such as reading. Instead of the eyes focusing together on the near object, one deviates outward.
Far-sightedness, also known as long-sightedness, hypermetropia, and hyperopia, is a condition of the eye where distant objects are seen clearly but near objects appear blurred. This blur is due to incoming light being focused behind, instead of on, the retina due to insufficient accommodation by the lens. [ 6 ]