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Diseases of the visual system

Presbyopia
The presbyopia (the Greek πρέσβυς ‚old‘), also known as farsightedness , is an eye defect associated with age that usually occurs between 40-45 [...]
Myopia
The myopia (the Greek μύω, „getting (eyes)“ and ὄψ, „eye“ ) is a refractive defect of the eye in which rays of light parallel [...]
Farsightedness
The farsightedness (from the words Greek υπερ, hyper meaning „above“, μέτρον, metron „measure“ and ὄψ, eye ) is an ocular [...]
Squint
The strabismus is the deviation of alignment of an eye relative to each other, preventing the fixing bifocal. This prevents you from fixing the eyes of [...]
Astigmatism
In ophthalmology and optometric the astigmatism (the Greek ἀ- „no“ and στιγμή „point“) is an eye defect characterized in that there [...]
Amblyopia
The amblyopia (Greek ἀμβλύς [ amblýs ], ‚weak‘ and ὄψ [ ops ], ‚eye‘) is a decrease in visual acuity without there being any [...]
Optical aberrations of the eye
The eye, like any other optical system, suffers from a series of specific optical aberrations. The optical quality of the eye is limited by optical [...]
Xerophthalmia
The dry eye is a disease eye characterized by persistent dryness of the conjunctiva and opacity of the cornea . The term comes from the Greek xerophthalmia [...]
Xantopsy
The term xanthopsia is used in medicine to describe an alteration in the perception of colors in which all visible objects appear to have a yellowish hue. [...]
Xanthelasma
Xantlelasma is a medical term used to call small benign fatty tumors or uprisings (cholesterol esters) located in or around the eyelids . These deposits [...]
Usher Syndrome
The Usher syndrome , also known as Hallgren syndrome or Usher-Hallgren syndrome is a rare genetic disorder associated with a mutation in one of the ten [...]
Vogt-Koyanagi-Harada Syndrome
The Vogt-Koyanagi-Harada syndrome is a disease systemic autoimmune characterized by the emergence of uveitis , hearing loss , alopecia , encephalitis and [...]
Uveitis
The uveitis is inflammation of the uvea , the middle layer eye located between the sclera and the retina . The uvea provides most of the blood supply to [...]
Tumors of the orbit
The orbital tumors are a frequent alteration in the pathology orbital. Clinical picture The most characteristic of a tumor of the orbit clinical sign is [...]
Ocular Tuberculosis
The tuberculosis is an infectious disease caused by Mycobacterium tuberculosis that primarily affects the lungs , but also to other body organs. According [...]
Tritanopia
The tritanopia is a visual dysfunction related to color perception. It consists of the lack of sensitivity to blue color, also called blue dichromacy. It [...]
Tritanomaly
The tritanomaly is a congenital visual anomaly that affects color vision. The individual who presents it has reduced ability to distinguish the difference [...]
Triquiasis
The triquiasis is a disease ocular consisting of an alteration of the tabs , which grow abnormally in the direction of the eye , which causes rub against [...]
Trichromacy
The oligocónica trichromacy is a nonprogressive rare form of dysfunction of the cones , the photoreceptors of the retina , characterized by reduced visual [...]
Eye trauma
Physical or chemical injuries of the eye can be a serious threat to vision if not properly and timely addressed. The most obvious display of eye injuries [...]