Purchase this article with an account.
Victoria De-Juan, Mikel Aldaba, Raul Martin, Meritxell Vilaseca, Jose Maria Herreras, Jaume Puyol; Assessment Of The Optical Quality With A Double-pass System In Eyes With Contact Lens Induced Corneal Swelling. Invest. Ophthalmol. Vis. Sci. 2011;52(14):6526.
Download citation file:
© ARVO (1962-2015); The Authors (2016-present)
To quantify the effect of contact lens (CL) induced corneal swelling in the optical quality and intraocular scattering.
Optical quality (OQ) (Strehl ratio and OQAS values at contrasts 100%, 20% and 9% [OV100%, OV20%, OV9%]) and intraocular scattering (IS) (Objective Scatter Index, OSI) were monitored in 6 eyes (6 patients) with secondary corneal swelling due to CL wear with double-pass instrument (DP) (OQAS II, Visiometrics S.L., Spain). Corneal swelling was determined as the percentage change in the central corneal thickness (CCT) before and after CL wear using an OCT (3D OCT-2000, Topcon, Japan). This prospective study included five visits: Baseline and after sleeping with four different CL of +0.50D, +2.00D, +5.00D and +8.00D (Acuvue 2, Johnson & Johnson Vision Care, USA) on four different days. CL was randomized fitted in one eye and contra lateral was used as control. The relationship between OQ and IS and corneal swelling was analyzed by multiple ANOVA with Bonferroni correction and Pearson coefficient.
Mean age was 26.33±4.41 years (Mean ± SD) and 50% were men. In baseline visit we found a mean CCT of 536.39±36.22 µm, and OQ and IS parameters were: Strehl ratio 0.26±0.03; OV100% 1.43±0.22; OV20% 1.60±0.25; OV9% 1.57±0.26 and OSI 0.50±0.13. After CL wear we found a mean CCT of 593.65±47.28 µm (corneal swelling of 10.67±3.53%); Strehl ratio of 0.19±0.06; OV100% of 1.32±0.25; OV20% of 1.25±0.37; OV9% of 1.07±0.43 and OSI of 0.70±0.34. Statistical differences were found between eyes wearing CLs and control eyes (p<0.05 MANOVA). Good correlation between corneal swelling and OQ and IS was found (Strehl ratio r=-0.87; OV100% r=-0.45; OV20% r=-0.76; OV9% r=-0.99 and OSI r=0.64).
CL-induced corneal swelling can cause a worsening of the optical quality of the eye that can be measured and quantified with a non-invasive double-pass technique.
This PDF is available to Subscribers Only