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Conjunctivitis. Conjunctivitis, also known as pink eye, [ 4] is inflammation of the outermost layer of the white part of the eye and the inner surface of the eyelid. [ 5] It makes the eye appear pink or reddish. [ 1] Pain, burning, scratchiness, or itchiness may occur. [ 1] The affected eye may have increased tears or be "stuck shut" in the ...
Stereopsis. Stereopsis (from Ancient Greek στερεός ( stereós) 'solid' and ὄψις (ópsis) 'appearance, sight') is the component of depth perception retrieved through binocular vision. [ 1] Stereopsis is not the only contributor to depth perception, but it is a major one. Binocular vision happens because each eye receives a different ...
Line of sight. The line of sight, also known as visual axis or sightline (also sight line ), is an imaginary line between a viewer/ observer / spectator 's eye (s) and a subject of interest, or their relative direction. [ 1] The subject may be any definable object taken note of or to be taken note of by the observer, at any distance more than ...
Aphakia. Aphakia is the absence of the lens of the eye, due to surgical removal, such as in cataract surgery, a perforating wound or ulcer, or congenital anomaly. It causes a loss of ability to maintain focus ( accommodation ), high degree of farsightedness ( hyperopia ), [ 1] and a deep anterior chamber. Complications include detachment of the ...
Amblyopia. Anisometropia is a condition in which a person's eyes have substantially differing refractive power. [ 1] Generally, a difference in power of one diopter (1D) is the threshold for diagnosis of the condition. [ 2][ 3] Patients may have up to 3D of anisometropia before the condition becomes clinically significant due to headache, eye ...
Oculocardiac reflex. The oculocardiac reflex, also known as Aschner phenomenon, Aschner reflex, or Aschner–Dagnini reflex, is a decrease in pulse rate associated with traction applied to extraocular muscles and/or compression of the eyeball. [ 1] The reflex is mediated by nerve connections between the ophthalmic branch of the trigeminal ...
Keratoconus. Keratoconus ( KC) is a disorder of the eye that results in progressive thinning of the cornea. [ 3] This may result in blurry vision, double vision, nearsightedness, irregular astigmatism, [ 4] and light sensitivity leading to poor quality-of-life. [ 3][ 5] Usually both eyes are affected. [ 3] In more severe cases a scarring or a ...
We've all grown up thinking that sitting too close to the television is damaging to our eyes ... but that might not be the case. Technology spawns lots of confusion ... and a few affectionately ...