Tear break-up time in eyes with pterygia
and pingueculae in Ibadan.
5] A survey of health care providers in migrant farmworker clinics conducted for the Migrant Clinicians Network in 1996 found that refractive errors were the most common eye problems seen in migrant patients, followed by eye infections, diabetes-related eye problems, and pterygia
are cloudy growths that creep out onto the front of the eye, block light, and lead to blindness if untreated.
Outwardly, unsightly yellowish-red growths called pterygia
are a direct result of constant ultraviolet exposure, and so is a persistent redness of the eye.
PLF is responsible for the typically nasal location of pterygia
, and as the crystalline lens and eyelid margin are also affected, is implicated in the development of early cortical cataract and eyelid skin malignancies on the nasal side.
The most common condition on the surface of the eye is pterygia
, a red, irritating growth on the eye often effecting waterman.
are widely believed to be due to excessive exposure to sunlight, (3,4) and a long duration of ultraviolet radiation has been reported to be responsible for its development.
They include pterygia
(abnormal fibrovascular tissue arising from the conjunctiva and extending onto the cornea, sometimes partially blocking vision and requiring surgery for removal), photokeratitis (temporary but painful inflammation of the cornea, also known as "snow blindness" and "welders' flash"), cataracts, and age-related macular degeneration (AMD) (1).
Hispanics are also at higher risk for many eye health issues, including pterygia
and glaucoma, as well as macular degeneration and cataracts, which have both been linked to UV exposure.
Reported or proposed associations with pterygia
Studies have shown that light rays entering the eye from the side are focused and intensified at the nasal limbus, where pterygia
are most common, and the nasal lens cortex, the most likely site for cortical cataracts (1,2).
1,2) It is one of the most common conditions of the conjunctiva, and surgery to remove pterygia
is practised widely.
UV exposure, wind and dust can also cause pterygia
, benign growths on the eye's surface.