Differences in the patterns of crystallization of tears (ferning test) with the use of hydrogel and silicone hydrogel contact lenses

Abstract

<em><strong>Objective:</strong></em> The purpose of this investigation was to determine the variation of tears ferning patterns in soft contact lens wearers of hydrogel and silicone hydrogel. <em><strong>Methods:</strong></em> 8 patients that never have worn contact lenses were fitting with hydrogel contact lenses (Alphafilcon A) in one eye, and silicone hydrogel balafilcon A) in the other eye. Crystallization test was performed before the contact lens fitting and within two weeks of lens wear and the patterns were classified according to the scale tear ferning test of Roland. <em><strong>Results:</strong></em> There was an increase in the degree tear fern pattern in 50% of the hydrogel lens wearers and 50% of silicone hydrogel. <em><strong>Conclusions:</strong></em> The use of soft contact lens hydrogel and silicone hydrogel causes changes in the pattern of tear ferns and there are not differences between the two types of lenses.