Kr 8100pa

Twenty-four male subjects from Air Force Medical University were recruited; their ages ranged from 20 to 35 (mean 27.75 ± 4.33) years. The inclusion criteria for selecting participants were as follows: spherical degree (D) − 2.00 D ~ + 2.50 D, cylindrical degree − 1.00 D ~ + 1.00 D, and best-corrected VA ≥ 1.0 (decimal vision). The exclusion criteria were a history of refractive surgery, central nervous system disease, glaucoma, diabetic retinopathy, and other organic ocular diseases. The experiments were conducted in the same laboratory under the same luminance environment, and all subjects rested and adapted to the light environment for 10 min before the examination. An automated, computerized refractive examiner (KR-8100PA, Topcon, Japan) was used to detect the subjects’ refractive condition. First, the refractive error of the subjects was examined. After meeting the criteria, twenty-four subjects were randomly divided into four groups: 1.0/1.0, 0.8/0.8, 0.6/0.6, and 0.4/0.4 (decimal vision). Six subjects and twelve eyes were in each group. Second, subjects were checked for monocular VA at 5 m using a standard logarithmic visual acuity E chart with 96% contrast in a 200 cd/m² luminance lightbox. Finally, the subjects were corrected to the corresponding VA using the subjective insertion method with appropriate lenses.