1. A system of automatic computer analysis for photoscreening system that comprises: a strabismus module that analyzes ocular fixation and motility; a single-eye module that analyzes abnormalities of each single eye; and an eye-correlation module that compares differences of retinal reflex between two eyes, wherein the strabismus module determines an examinee's convergence and fixation angle; and compares the examinee's convergence and fixation angle with regions of normal, abnormal, and uncertain results to indicate whether a captured ocular image shows an abnormality related to strabismus.