Sudhir Rachapalle Reddi, Farhath Pattan Hadiya, Rathore Mehal, Kuppuswamy Parthasarathy Mohana, Padmanabhan Prema, Lakshminarayanan Vasudevan
Department of Cornea & Refractive Surgery, Medical Research Foundation, Sankara Nethralaya, Chennai, Tamil Nadu, India.
Elite School of Optometry, Unit of Medical Research Foundation, Chennai, Affiliated to SASTRA University, Thanjavur, Tamil Nadu, India.
Indian J Ophthalmol. 2020 Dec;68(12):2998-3001. doi: 10.4103/ijo.IJO_1512_20.
The aim of this study was to measure blur thresholds before and after refractive surgery.
In this prospective cohort study conducted in a tertiary eye hospital in South India. Blur thresholds were measured for 30 young adult myopic patients 1 month prior to and after refractive surgery. Patients were asked to report three stages of blur, namely Detectable Blur (DB), Bothersome Blur (BB), and Non-resolvable Blur (NB). Blur was created by adding plus lenses (in steps of 0.12D) over their optimal subjective refraction. The blur judgments were made both monocularly and binocularly when looking through a 3 mm artificial pupil at one line above the best-corrected visual acuity.
A total of 30 participants were included in this study (mean age = 25.5 ± 3.8 (20-36) years; 77% female). The mean binocular preoperative blur of this group was: DB = 0.39 ± 0.26D, BB = 0.74 ± 0.28D and NB = 1.04 ± 0.42D. The corresponding mean binocular blur one-month post-operatively was DB = 0.46 ± 0.28D, BB = 0.83 ± 0.35D, and NB = 1.21 ± 0.44D. Although there was a marginal increase in the blur thresholds postoperatively, the difference was not statistically significant (DB: P = 0.320; BB: P = 0.229; NB: P = 0.054).
All three blur thresholds showed an insignificant minimal increase at 1 month post-operatively suggesting that patients adapt to the induced blur following refractive surgery. A longer follow up would reveal how the adaptation to blur would change with time.
本研究旨在测量屈光手术前后的模糊阈值。
在印度南部一家三级眼科医院进行的这项前瞻性队列研究中，对30名年轻成年近视患者在屈光手术前1个月和术后进行模糊阈值测量。要求患者报告三个模糊阶段，即可察觉模糊（DB）、困扰性模糊（BB）和无法分辨的模糊（NB）。通过在其最佳主观验光结果上增加正透镜（以0.12D为步长）来产生模糊。当通过3mm人工瞳孔在最佳矫正视力上方一行处观察时，单眼和双眼进行模糊判断。
本研究共纳入30名参与者（平均年龄 = 25.5 ± 3.8（20 - 36）岁；77%为女性）。该组术前平均双眼模糊度为：DB = 0.39 ± 0.26D，BB = 0.74 ± 0.28D，NB = 1.04 ± 0.42D。术后1个月相应的平均双眼模糊度为DB = 0.46 ± 0.28D，BB = 0.83 ± 0.35D，NB = 1.21 ± 0.44D。尽管术后模糊阈值有轻微增加，但差异无统计学意义（DB：P = 0.320；BB：P = 0.229；NB：P = 0.054）。
所有三个模糊阈值在术后1个月均显示出极小的不显著增加，表明患者在屈光手术后能适应所诱导的模糊。更长时间的随访将揭示对模糊的适应如何随时间变化。
