9Thorn F,Gwiazda J,et al,The development of eye alignment,convergence,and sensory binocularity in yong infants.Invest Ophthalmol Vis Sci,1994,35:544.
10Ciner EB,Scheiman MM.Schanel-Klitseh E,et al.Stereopsis testing in 18 to 35 monthold children using operant preferential lookingoptometry.Vis Sci,1989,66:782.