Vasudevan Balamurali, Fisher Brian, Case Barry, Lam Phu, Wayman Jeff
College of Optometry Midwestern University, Glendale, AZ, 85308, USA.
BMC Ophthalmol. 2015 Jan 24;15:11. doi: 10.1186/1471-2415-15-11.
The aim of the present study was to investigate the effect of near-work on lower and higher-order aberrations, and its progression over a 9-month period during the school year.
Data from 24 young-adult myopic eyes, and 24 non-myopic eyes were used in this investigation. The lower-order aberrations, coma, spherical aberration (SA), and total root mean square (RMS) of higher order aberrations (total HOA) were measured using an open-field iTrace aberrometer, at both the initial baseline evaluation, and then at the follow-up visits over a 9-month period. Pupil size of 4 mm was used for the aberration measurements.
The group mean (SD) of the subjects (mean age: 23.6 +/- 3.4 years) at the initial and follow-up visit was 0.47D (0.47D) and 0.31D (0.41D), in the non-myopes and -3.58D (2.08D) and -3.86D (2.14D) in the myopes, respectively. Significant increases in myopic refraction were observed. The group mean (SD) total HOA at the initial and final visit was 0.12 (0.08) and 0.11 (0.06) microns, in the non-myopes, and 0.15 (0.08) and 0.15 (0.08) microns, in the myopes, respectively. The group mean RMS of the coma at the initial and final visit was 0.06 (0.04) and 0.07 (0.05), in the non-myopes, and 0.08 (0.06) and 0.09 (0.06) microns, in the myopes, respectively. The group mean SA of the subjects at the initial and last visit was 0.04 (0.04) and 0.03 (0.03), in the non-myopes, and 0.04 (0.04) and 0.04 (0.04) microns, in the myopes, respectively.
There was a significant difference in myopic refraction, over the 9-month assessment period. However, no significant difference in total HOA, SA, and coma between the initial and follow-up visits in both the myopes and the non-myopes was observed.
本研究旨在调查近距工作对低阶和高阶像差的影响，以及在学年期间9个月内其变化情况。
本研究使用了24只年轻成人近视眼睛和24只非近视眼睛的数据。使用开放式iTrace像差仪在初始基线评估时以及在9个月期间的随访时测量低阶像差、彗差、球差（SA）和高阶像差的总均方根（RMS）（总高阶像差）。像差测量时使用4mm的瞳孔直径。
在初始和随访时，非近视组受试者（平均年龄：23.6±3.4岁）的组均值（标准差）分别为0.47D（0.47D）和0.31D（0.41D），近视组分别为-3.58D（2.08D）和-3.86D（2.14D）。观察到近视屈光有显著增加。在初始和最终随访时，非近视组总高阶像差的组均值（标准差）分别为0.12（0.08）和0.11（0.06）微米，近视组分别为0.15（0.08）和0.15（0.08）微米。在初始和最终随访时，非近视组彗差的组均值RMS分别为0.06（0.04）和0.07（0.05）微米，近视组分别为0.08（0.06）和0.09（0.06）微米。在初始和最后随访时，非近视组受试者的组均值球差分别为0.04（0.04）和0.03（0.03）微米，近视组分别为0.04（0.04）和0.04（0.04）微米。
在9个月的评估期内，近视屈光存在显著差异。然而，在近视组和非近视组的初始和随访之间，总高阶像差、球差和彗差均未观察到显著差异。
