Corneal white-to-white distance and mesopic pupil diameter |
| |
Authors: | Hasan Basri Cakmak Nurullah Cagil Huseyin Simavli and Sabri Raza |
| |
Institution: | 1.Yıldırım Beyazıt Universitesi, Ataturk Egitim ve Arastırma Hastanesi, Bilkent yolu No: 3 Bilkent, Ankara, Turkey;2.Bolu State Hospital, Bolu, Turkey;3.Ankara Atatürk Education and Research Hospital, Ankara, Turkey |
| |
Abstract: | AIM: To study the relationship between corneal white-to-white (WTW) distance and mesopic pupil diameter.
METHODS: This study is composed of 30 cases that underwent photorefractive keratotomy (PRK). Pupil size measurements were performed with Schwind ORK wavefront analyzer in mesopic conditions. WTW distance was measured with a measuring caliper. Also, A-scan ultrasound examination was performed in all patients. The relationship among the mesopic pupil diameter and age, sex, axial length, lens thickness, anterior chamber depth(ACD), horizontal WTW distance, vertical WTW distance, spherical equivalent, and average keratometry were analyzed with univariate and multivariate regression analysis.
RESULTS: Mean pupil diameter was (6.39±0.80)mm (range: 3.70mm-7.73mm). Horizontal WTW distance measurements were between 11.00mm and 12.50mm and mean horizontal WTW distance was (11.79±0.43)mm. On the other hand, vertical WTW distances ranged between 10.00mm and 13.00mm, and their mean was (11.42±0.72)mm. Bivariate correlation between pupil diameter and other variables showed that the axial length, ACD, spherical equivalent, and horizontal WTW distance had a moderate correlation with mesopic pupil diameter. Multiple regression analysis revealed that spherical equivalent and horizontal WTW distances were significantly associated with mesopic pupil diameter (R=0.598, R2=0.358 P=0.02).
CONCLUSION: This study shows that mesopic pupil diameter is closely related to horizontal WTW distance. These two factors must be taken in consideration together in preoperative ablation zone planning. |
| |
Keywords: | mesopic pupil diameter photorefractive keratectomy white-to-white distance |
本文献已被 PubMed 等数据库收录! |
| 点击此处可从《国际眼科杂志(英文版)》浏览原始摘要信息 |
| 点击此处可从《国际眼科杂志(英文版)》下载免费的PDF全文 |
|