Purpose: To examine whether the results of the Verhoeff stereoptor would correlate with those of clinical stereopsis tests used in optometric practice.
Methods: This study involved 40 normal young adults, 18 women and 22 men, with ages of 21.82±1.22 years. All participants had visual acuity with better than 0.8 in conditions with or without glasses or contact lenses and they had no strabismus. The stereotests were performed that TNO test and Titmus test were at 40 cm, and Verhoeff stereoptor (a depth of 2.5 mm) and Frisby test (a depth of 6.0 mm) were at depth perception threshold (at closer distances recognizing depth perception). All tests were repeated four times and stereoacuity was expressed by mean seconds of arc.
Results: The depth perception threshold were 871.43±243.19 mm in Verhoeff stereoptor and 772.86±439.34 mm in the Frisby test. The depth perception threshold in Verhoeff stereoptor showed a positive correlation with Frisby test (r=0.769, p=0.000). The stereoacuity were 51.30±24.12 seconds of arc in Verhoeff stereoptor, 235.94±292.29 seconds of arc in Frisby test, 100.59±71.10 seconds of arc in TNO Stereotest and 71.90±52.40 seconds of arc in Titmus Stereotest.
Conclusions: Verhoeff stereoptor test, examining depth perception has the lowest standard deviation in four different tests and a positive correlation with Frisby stereopsis test.

• HyeongSu KIM(Department of Optometry, Kangwon National University)
• ByeongYeon Moon(Department of Optometry, Kangwon National University)
• DongSik Yu(Department of Optometry, Kangwon National University)
• HyunGug Cho(Department of Optometry, Kangwon National University)