Effect of Illunmination on Stereoacuity.

Lee, Chang Hwan; Choi, Dong Gyu

Original Article

Journal of the Korean Ophthalmological Society 2002;43(10):1963-1967.
Published online October 1, 2002.

Effect of Illunmination on Stereoacuity.

Department of Ophthalmology, Kangnam Sacred Heart Hospital, College of Medicine, Hallym University, Seoul, Korea. choi4859@kornet.net

조도가 입체시에 미치는 영향

이창환 ( Chang Hwan Lee ) , 최동규 ( Dong Gyu Choi )

Abstract

PURPOSE
To investigate the effect of illumination on stereoacuity and to evaluate adequate illumination for each stereotest. METHODS: We measured stereoacuity by Titmus stereotest, TNO stereotest, Lang stereotest in normal group of 40 cases and strabismus group of 26 cases with five levels of illumination. The statistical analysis was performed to compare the mean stereoacuity between different levels of illumination using Student t-test. RESULT: In Titmus stereotest, stereoacuity improved as illumination increased up to 60 lux, which was statistically significant (P< 0.05). In TNO stereotest, stereoacuity significantly improved as illumination increased up to 200 lux in normal group (P< 0.01), and up to 60 lux in strabismus group (P=0.01). In Lang stereotest, 100% of normal group passed the test under 20 lux or more, and 100% of strabismus group passed the test under 60 lux or more. DISCUSSION: The illumination of 60 lux or more was required for Titmus stereotest and 200 lux or more for TNO stereotest, which was sufficient with the room illumination. Lang stereotest is less influenced by illumination and could be performed under lower illumination than other stereotests.

Key Words: Illumination;Steroacuity;Titmus stereotest;Lang stereotest;TNO stereotest