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Peviously we reported that aspects of stereopsis were demonstrated using the dynamic randamdot stereogram (DRDS) in patients even after diagnosed as "stereoblind" by the Titmus Stereotest (TST) and LANG Stereotest. In this study, we compared the result of peripheral fusion evaluated by the New 4-Dot Test (N4D) with those of motion stereopsis evaluated by DRDS and static stereopsis evaluated by the Fly test in TST. Included were 132 patients who were examined during june 1995 to October 1996. The results showed that those who did not pass N4D were unable to pass both Fly test and DRDS, suggesting that peripheral fusion evaluated by N4D is a fundamental binocular visual function necessary to achieve static or dynamic stereopsis. Interestingly, some patients who passed Fly test failed DRDS while others who passed DRDS faild Fly test. These two groups may be different in nature and thus Fly test and DRDS may represent different aspect of stereopsis. Those who have large angle of strabismus showed better result in DRDS as compared with Fly test, suggesting that motion stereopsis allows wider fusional area than static stereopsis. In young patients, less people passed the Fly test and DRDS, suggesting that reexamination is necessary when patients grow older. As Fly test and DRDS may represent differnt aspects of stereopsis, the use of different kind of stereogram is necessary to evaluate stereopsis.

Periphral Fusion Compared with Motion and Static Stereopsis in Patient with Strabismus.