The purpose of this study was to investigate the influence of sustained 30 minutes of near work upon the length of the eye in patients that don't need vision correction and those that are near sighted.
Forty young adult subjects (20 near-sighted and 20 normals) were recruited for the study. Length from the front to the back of the eye was measured with a precision instrument before, immediately after and then again 10 min after using the eyes very close for 30 minutes.
The length of the eye increased immediately following close work but returned to normal size after 10 minutes. The effect was significantly greater in near-sighted patients than in normal patients