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We carried out stereoacuity tests on the subjects using the 3D visual function trainer ORTe (Japan Focus Company, Japan). Informed consent was obtained from all subjects after an explanation of the nature and possible consequences of the study. Potential subjects gave written consent after being given detailed information about the study and their role as a participant. The methods were carried out in accordance with approved guidelines. This research conformed to the tenets of the Declaration of Helsinki and was approved by the Kitasato University Human Sciences Ethics Committee (2010-020).
If the subjects felt fatigued during the procedure, the experiment was stopped immediately. Far and near eye position of all subjects were less than 10 Δ.
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No subject had ophthalmic disease other than minor refractive error, and each eye had distance and near vision values of −0.08 (logMAR) under full refractive correction. Twenty-four subjects (mean age ± standard deviation, 21.8 ± 0.8 years) participated in the study. We investigated the effects of target size and test distance on stereoacuity using a 3D monitor that can display targets under various conditions, and we achieved our purpose.
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No previous study has considered both target size and test distance. To investigate test distance, it is necessary to consider the target size, as target size decreases as the test distance increases. However, the binocular separation method was not consistent, and target size did not necessarily correlate with test distance in previous studies. However, in previous studies, there are various opinions about the effect of test distance on stereoacuity as a far stereoacuity test was easier to recognize than near one, there was no difference between far and near stereoacuity test, and it depended on the subjects. To date, many studies on the effect of test distance on stereoacuity have been performed. In addition, there is a report that stereoacuity, which the near stereoacuity test cannot detect, is detected by the far stereoacuity test. There are many reports demonstrating that the far stereoacuity test is superior for detection of an abnormality (especially intermittent exotropia) versus the near stereoacuity test. Recently, not only the near stereoacuity test, but also the far stereoacuity test has been used widely in clinical ophthalmology. Devices also differ in test distance, target size, and binocular separation method. In the past, it was reported that a dynamic stereo target was more easily recognizable than a static stereo target. There are many differences between stereoacuity test devices used in clinical ophthalmology and movies and attractions that use 3D technology, such as whether they are static or dynamic, the target size, and the test distance.
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Some patients who are diagnosed as having no stereopsis by conventional stereoacuity tests, such as the Titmus stereo test and TNO stereo test, can enjoy three-dimensional (3D) movies. Stereoacuity tests can be carried out easily and quickly to detect strabismus and amblyopia and to judge the degree of binocular vision after refractive correction. Stereoacuity should be estimated by both parallax and other elements, including test distance and target size. Stereoacuity at a 5.0 m distance was significantly better than at 2.5 m ( P = 0.04). Stereoacuity at a 7.5 m distance was significantly better than at distances of 2.5 m and 5.0 m ( P < 0.0001 and P = 0.02, resp.). Test distances of 2.5, 5.0, and 7.5 m were investigated for a 0.5° target size crossed parallax was presented in 22-second units. Stereoacuity was significantly worse with a 0.1° target than with 0.2°, 0.5°, and 0.9° target sizes ( P = 0.03, P < 0.0001, and P < 0.0001, resp.). The test distance was 2.5 m for 0.1°, 0.2°, 0.5°, and 0.9° target sizes crossed parallax was presented in 22-second units. Target size and test distance effects on stereoacuity were investigated in 24 subjects using a three-dimensional monitor.