Effect Of Contact Lens Correction On Tear Film
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Date
2019-01
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Society Of Medical Sciences
Abstract
Purpose: This study is conducted to find out changes in tear films take place due to use of contact lensesin Irregular corneal astigmatisms. Aim is to evaluate changes in the quantity and quality of tear film with long term use of contact lenses. Method: Slit Lamp Biomicroscopy of the anterior segment (lids, cornea, and conjunctiva) was conducted. During this examination, Bulbar and limbal conjunctiva, lid margins and corneal surface analysis was done. Results: Tear volume:In terms of tear volume Clinically and statistically significant changes are found P= 1.89E-12Tear film integrity helps to maintain an optically uniform interface between air and the anterior surface on contact lens that would affect visual function. Dogruet al.4and Mohd-Ali et al.5reported that keratoconus patients have poor tear stability compared to normal people. Few studies have reported the effect of RGP contact lens wear on the tear film of eyes with keratoconus. Results from this study showed that prolonged RGP contact lens wear had a significant effect on tears quality of keratoconic eyes.This agreed with a study reported by Moon et al.6who found that tear film changes in keratoconus could be directly related to contact lens wear. In present study it is clear that all other causes of corneal irregularities also show change in tear volume in contact lens wear. All different RGP lenses as well as soft lens users are showing decrease in tear volume after continues use of 6 months. TFBT: Thai et al.7who stated that all contact lenses materials significantly and adverselyaffected tear physiology by increasing evaporation rate and decreasing tear thinning timeResults from this study agreed Mohd-Ali et al.8who found minimal changes in tear characteristics after 6 months of continuous wear of Dk value above 90. Present study found significant change in TFBT where theAnova calculation gives the P =9.02E-05 which is different from the previous finding. All different RGP lenses as well as soft lens users are showing decrease in TBFT after continues use of 6 months. No significant gender influence was found among the lens wearers. Conclusion: Subjects with irregular corneal astigmatism who wear RGP contact lenses have poor tear stability which needs to be evaluated appropriately during management of such patients; both systemic and ocular signs of dry eye condition should be managed prior and during contact lens wear. In soft lens wearers also tear volume and TFBT shows significant decrease. As per the results practitioner should examine contact lens users in proper follow-up intervals so that if necessary they may manage the tear related alterations if found clinically required. Possible causes could be masking of corneal surface from the lid interactions and reduced sensitivity due to adaptation.
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Samanta, Atanu, Trivedi, Nitin V. Effect Of Contact Lens Correction On Tear Film. Society Of Medical Sciences. 2019 Jan; 21(32): 1-11