Abstract:AIM:To demonstrate the accuratissime of a devised software in the strabismometry of comitant strabismus.METHODS:One hundred and seventy-two comitant strabismus patients,including 41 intermittent exotropia,were consecutively included in the study.The new software was used to test the squint angle.The traditional way to test the squint angle including Hirschberg test,prism-cover tests,perimeter test and measurement with major amblyoscope,etc.were compared as controls.The tropia was mainly consulted the perimeter test results.RESULTS:The squint angle tested with software had significant difference with that of the traditional way(P<0.05) in 131 patients of comitant strabismus,excluding the intermittent exotropia.But the comparison had no clinical speciality significance.Difference mean modulus was below 5.However,the difference mean modulus exceeded 5 between the two ways in testing the squint angle in the 41 patients of intermittent exotropia.CONCLUSION:Using the software to test the squint angle in commitant strabismus is a precise way.However it is not suitable for the patients of intermittent exotropia.