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Shinji Arai, Hiroshi Uozato, Masakazu Hirota; The Dynamic Accommodative Response with the Binocular open-field autorefractor and a Movable Real Target. Invest. Ophthalmol. Vis. Sci. 2013;54(15):4261.
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© ARVO (1962-2015); The Authors (2016-present)
To evaluate the dynamic characteristic of accommodation in the open field and real target using new device WMT-1
Fourteen volunteers (6 men and 8 women; mean ± standard deviation age, 23.9 ± 4.0 years; range, 19 to 33 years) participated in our study. All subject had a visual acuity 20/20 or better and normal ocular health. Each subject’s accommodative response was measured by target moving system WMT-1 (Grand Seiko Co., Ltd, Hiroshima, Japan) dynamically. The WMT-1 is a new device that is connected to the WAM-5500 open-field autorefractor. It can move a target optionally from 0.2 to 1.0 meter and measure refraction every 0.2 second. We made shape of the cross as a visual target, displayed it in iPad (Apple Inc., Cupertino, CA). We evaluated three difference movements that had been programmed on the WMT-1. First, the constant diopter triangle drive. Second, constant velocity triangle drive. Third, diopter sin drive. We measured dynamically accommodative response in visual target distance from 1.0 meter to 0.2 meter. We compared maximum quantity of accommodative response and among three movements.
The maximum quantity of accommodative response of Diopter Sin Drive became larger than Constant Velocity Triangle Drive (p < 0.05, Scheffe test). However, statistical significantly difference was not found to other comparison. Accommodative response related to movement of visual target.
We could measure dynamic characteristic of accommodation in the open field and real target using the WMT-1. The accommodation is evaluated at a definite point conventionally. The WMT-1 is useful to evaluate the dynamic characteristic of accommodation, because it can measure not only maximum quantity of accommodative response but also process of accommodative response.
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