Posters

The effect of contact lens wear on cornea and refraction

Poster Details

First Author: K.Loncaric CROATIA

Co Author(s):    I. Krolo   I. Radman   A. Kasumović   Z. Vatavuk           

Abstract Details

Purpose:

To examine the effect of new soft contact lens (SCL) and rigid gas-permeable contact lens (RGPCL) wear, as well as their cessation in long time wearers, on corneal and refractive parameters measured by rotating Scheimpflug camera system (Pentacam®) and auto refracto/keratometer (Indo eRK-10).

Setting:

Sestre milosrdnice University Hospital Center, Zagreb, Croatia

Methods:

48 eyes of new SCL (nSCL) and 8 of new RGPCL (nRGPCL) at the time of the initial exam and on 30th day following the wear of the newly prescribed contact lens were analyzed. 20 established SCL (eSCL) and 14 established RGPCL (eRGPCL) wearer eyes, before and following 3 day and 7-10 day cessation of contact lens wear were analyzed, respectively. We measured keratometry parameters K1 and K2, central corneal thickness (CCT) and thinnest location (TL) using Pentacam, keratometry K1 and K2 and refractive parameters using auto refracto/keratometer Indo eRK-10 and subjective spectacles and contact lens refraction.

Results:

No significant differences in CCT and TL were found for all groups. As for keratometry parameters K1 and K2, no significant difference was found in the nSCL group, and significant difference (p<0.05) was found in eSCL ( 0.1D increase in Pentacam K1), in nRGPCL (0.31D decrease in ARK K2) and in eRGPCL (0.4D increase in Pentacam K2 and 0.37D increase in ARK K2). As for refraction, only the eRGPCL showed significant -0.90 dcyl  change in spectacles.

Conclusions:

Results suggest that SCL wear does not influence corneal curvature, thickness nor refractive parameters, therefore questioning the established rule of 3-day SCL wear cessation before prescribing glasses and contact lenses. However, for the eRGPCL eyes contact lens cessation showed statistically significant corneal and refractive parameters changes thus supporting the recommended RGPCL cesession before new spectacles prescription.

Financial Disclosure:

None