Abstract
Prospective two years study of the dry eye status following use of soft contact lens. Based on the Schirmer test results, 10 % soft contact lens wearers developed mild dry eye at the end of 1 year and 15 % developed mild dry eye at the end of 2 years. No patient had moderate or severe dry eye. Based on the Tear film break up time results, 17 % soft contact lens wearers developed mild dry eye at the end of 1 year and 30 % developed mild dry eye at the end of 2 years. 1% had moderate dry eye at the end of 2 years. No patient had severe dry eye.
 Keywords: Schirmer test, Tear film break up time, soft contact lens, dry eye
Highlights
The preocular tear film is a complex three layer structure resting on the corneal and conjunctival surfaces of the eye
Based on the Tear film break up time results, 17 % soft contact lens wearers developed mild dry eye at the end of 1 year and 30 % developed mild dry eye at the end of 2 years. 1% had moderate dry eye at the end of 2 years
To determine the dry eye status based on the Schirmer test and Tear film break up time test results following 1 year and 2 years use of soft contact lens
Summary
The preocular tear film is a complex three layer structure resting on the corneal and conjunctival surfaces of the eye. The tear film break-up time (TBUT) describes the stability of the tear film This test is considered to be more reliable than the Schirmer test as it is repeatable (1) and minimally invasive. Schirmer test and Tear film break up tie test are two common tests which can be done in most eye hospitals These two tests were chosen to determine the contact lens induced dry eye status. Studies by Guillon et al (4) and Nichols JJ et al (5) have found contact lens induced dry eye symptoms in 40 - 50% of soft contact lens wearers. The test lacks standardization,is inaccurate and unrepeatable because of the reflex secretion produced by its invasive nature It measures only tear production and the evaporative aspects of dry eye are overlooked.
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