ESCRS - PO0245 - A New Technique For Fitting Of Tricurve Rigid Gas Permeable Contact Lens In Penetrating Keratoplasty Eyes Using Scheimpflug Imaging

A New Technique For Fitting Of Tricurve Rigid Gas Permeable Contact Lens In Penetrating Keratoplasty Eyes Using Scheimpflug Imaging

Published 2023 - 41st Congress of the ESCRS

Reference: PO0245 | Type: Free paper | DOI: 10.82333/80ed-jy82

Authors: Pratik Gogri* 1 , Vishwa Sanghavi 2 , Sushank Bhalerao 3 , Faiza Bhombal 4

1Cornea, Cataract and Refractive Surgery Services,Agarwals Eye Institute,Navi Mumbai,India, 2Contact Lens and Myopia Clinic,Agarwals Eye Institute,Mumbai,India, 3Cornea, Cataract and Refractive Surgery Services,LV Prasad Eye Institute,Vijayawada,India, 4Contact Lens and Myopia Clinic,Krishna Eye Institute,Mumbai,India

Purpose

Rigid gas permeable (RGP) contact lens fitting after penetrating keratoplasty (PK) is challenging due to significant irregular astigmatism. The aim of the study was to determine a guideline for selecting the initial base curve (BC) of the RGP contact lens fitting in post PK eyes.

Setting

Bausch and Lomb Contact Lens Center, LV Prasad Eye Institute, Hyderabad, India.

Methods

The data of patients who had tricurve RGP contact lens fitting post PK were collected retrospectively. Following data were collected: best corrected visual acuity (BCVA) with glasses and contact lenses; contact lens parameters which included the BC and diameter; corneal topography parameters which included steep keratometry value (K), flat-K, mean-K; and anterior Best Fit Sphere (BFS) measured using Scheimpflug imaging.

Results

The median age of the 40 subjects (46 eyes) who met the inclusion criteria was 37.5 years (IQR 26.7-45.5). The spherical equivalent was –3.00 diopter (D) (–8.31 to –1.56). The median steep-K, flat-K and mean-K in them were 6.76 mm (6.28-7.07), 7.78 mm (7.37-8.14) and 7.26 mm (6.93-7.46) respectively. The median anterior BFS value of the transplanted cornea was 6.96 mm (6.6-7.37). The median BC of final RGP lens was 7.0 mm (6.7-7.23) and the median diameter was 9.8 mm (9.4-10.4). Among all the Scheimpflug imaging parameters, the BFS correlated well with final BC of the RGP contact lens dispensed (R 0.742, p<0.0001).

Conclusions

The anterior corneal surface BFS value can be used as a reference in selecting the initial base curve of tricurve RGP contact lens to achieve the best fitting and reducing the chair time of patients after PK.