Different refractive status demonstrated different accommodative stamina under natural binocular near viewing condition

The emmetropes and myopes were reported to have different monocular accommodative stamina at distance, but not at near. The purpose of this study was to further investigate the binocular accommodative stamina under natural binocular viewing condition. Methods: Accommodative stamina of 40 young university students was investigated over one-minute duration with a ±2.00 D lens flipper at 40 cm. The measurement was done binocularly to ensure the natural interaction between accommodation and vergence. The data collection was recorded as cycle per minute (cpm). Results: There was a significant difference [t= -2.75, p = 0.01] in the near natural binocular accommodative stamina between emmetropes (mean = 7.90 cpm) and myopes (mean = 10.95 cpm). Discussion: The myopes demonstrated higher cyclic rate of accommodative stamina compared to emmetropes at near. These findings suggested that the ability to clear near optical blur might be different between emmetropes and myopes.