Applying lenticular-grating random-dot stereotest plate in the physical examination of Naval Air Force recruitment

Abstract

Objective To develop a new lenticular-grating random-dot stereotest plate and evaluate its practicability in the physical examination of Naval Air Force recruitment. Methods A new lenticular-grating random-dot stereotest plate was developed. The stereo-acuity of 861 subjects with normal vision (≥0.8) and eye position was respectively measured by the plate and Yan's Digital Stereovision Test Chart in the physical examination of Naval Air Force recruitment. Results The percentage of normal stereovision (stereo-acuity≤60″) was 98.03% by lenticular-grating stereotest plate and 97.44% by Yan's chart. No statistical significance was found between them (Z=-1.667, P>0.05). The stereo-acuity of 27 subjects was recognized with normal vision by lenticular-grating random-dot stereotest but ≥100″ by Yan's chart when they were in the natural light of overcast. As the auxiliary luminance applied, their stereo-acuity was recognized ≤60″ by Yan's chart. Conclusions The new lenticular-grating random-dot stereotest plate could accurately and promptly measure the threshold values of stereo-acuity. The plate has better sensitivity than Yan's Digital Stereovision Test Chart in dim light. The lenticular-grating random-dot stereotest plate shows favorable practicality in the physical examination of pilots recruitment. Key words: Depth perception; Diagnostic techniques, ophthalmological; Physical examination; Personnel selection