Comparisons of the Lang, Randot, TNO and New Stereo Tests in Screening and Office use in Children

ABSTRACT

Stereoacuity has given a reliable clue of detacting clinically important strabismus, amblyopia and anisometropia in children. There are many tests of stereoacuity in common use, and comparisions of these tse tests are needed for clinical application. Stereoacuity was investigated in 2 to 14-year-old children by using commercially available stereotests(Lang, Randot, TNO and New stereo tests). Each test was held exactly at right angles and at a distance of about 40 cm in front of the examinee and was illuminated about 160 lux. Various tests of stereopsis were discussed and their practicalities for clinical use was considered. Comparative analysis was done with each stereotest, and factors influencing stereoacuity threshold difference among the different tests were discussed. We knew many statistically interesting results and those were described in our study. Lang stereotest was simple and useful screening test in younger children. Randot stereotest was useful single method for screening and quantitative test.