Quantitative evaluation of night vision and correlation of refractive and topographical parameters with glare after orthokeratology
- نوع فایل : کتاب
- زبان : انگلیسی
- مؤلف : Takashi Kojima & Asato Hasegawa & Syuya Hara & Rie Horai & Yoko Yoshida & Tomoaki Nakamura & Murat Dogru & Kazuo Ichikawa
- چاپ و سال / کشور: 2011
Description
Purpose To evaluate night vision disturbance and investigate correlations between pre- and post-treatment parameters and glare scores in orthokeratology patients. Methods Twenty-eight right eyes of 28 patients were enrolled in this study. Corneal topography and a night vision test (NVT) to evaluate the extent of glare were performed after orthokeratology. From the corneal topography, two indices [surface regularity index (SRI) and surface asymmetry index (SAI)] were calculated. Fourier analysis was performed on the topographic data from the central 6 mm, and data were decomposed into asymmetric and higher order components for analysis. Results There was no correlation between the glare score and pre-treatment keratometric value, pre-treatment cylinder, posttreatment sphere, and post-treatment cylinder. However, there was a statistically significant correlation between pre-treatment sphere and glare score (Pearson correlation coefficient, r=-0.54, p<0.01). SRI and SAI significantly correlated with glare score (SRI: r=0.52, p<0.01, SAI: r=0.41, p<0.05). Higher order and asymmetric components were also significantly correlated with glare score (asymmetry: r=0.61, p<0.01, higher order: r=0.67, p<0.001). Conclusions The glare score was significantly correlated with corneal irregularity, and appeared to be a beneficial parameter for assessment of night vision performance in patients receiving orthokeratology.
Graefes Arch Clin Exp Ophthalmol DOI 10.1007/s00417-011-1696-7 Received: 27 March 2010 / Revised: 15 February 2011 / Accepted: 22 March 2011
