Nuha Fath Elrahman
Al-neelain University, Sudan
Title: The impact of Rose -K RGP contact lens wear on the visual performance of keratoconic eyes
Biography
Biography: Nuha Fath Elrahman
Abstract
Aim: The study was designed to be a comparative cross sectional study. It was aimed to evaluate the effect of rigid gas permeable
contact lense wear (Rose-k menicon) on visual performance (vision, color vision and contrast sensitivity) in keratoconic
patients with different degree of keratoconus. Material and method: The history of the patients was taken to be sure that the
patient have no history systemic and ocular diseases, the corneal curvature was measured by auto refkratometer (Nidek)
to determine the degree of KC, the vision was tested by Snellen´s test type (E-test). Refraction was done subjectively using
(stenopic slit), Rosek2 lenses (menicon) was use to correct refractive sate of the eye, the color vision was evaluated with
(Ishiaraa) test and contrast sensitivity with (low contrast slip Thark), these measurements were taken with and without Rose
k2 contact lens. Results: The data were analyzed using SPSS program and the following results were obtained: A total number
of 50 patients (100 eyes) were found to fulfil the criteria of selection (31 males and 19 female) their ages were ranged from
10 - 35 years with a mean of (22.72 years ±5.79). Ninety four percent of the patients had moderate (52%) to sever (42%)
keratoconus. Their base line vision ranged (1/60-6/9) with mean of 0.10±0.10, 99% of them less than 6/18, and with rose-k 2
contact lens was from (6/12 to 6/6 ) 97% their vision was within the normal limits from (6/9 to 6/6) with a mean of 0.88±0.20,
Independent t-test showed significant differences base line and with rosek2 P value 0.000 . The base line color vision showed
that 62% of the patients showed abnormal color vision and Chi-squire test yielded a significant difference between base line
color vision and color vision with contact rose -K CL P value 0.016. The base line contrast sensitivity ranged from 0.5 to 125
with mean of 1.08±0.14. 62% of the patients showed abnormal base line contrast sensitivity compared to 100% of normal
contrast sensitivity with rosek2 mean 1.25±0.00. Paired sample t-test showed a significant difference between baseline contrast
sensitivity and after wearing rose K contact lens P 0.000.
Conclusions: Rose -K RGP contact lenses significantly improve the visual performance