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Laura E. Sweeney, Lyle S. Gray, Dirk Seidel, Mhairi Day, Stewart Stanger; The Effect Of 3D Displays Upon Adaptative Components Of The Accommodation And Vergence Systems. Invest. Ophthalmol. Vis. Sci. 2012;53(14):4868.
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To determine the time course of adaptation in the accommodation and vergence systems following exposure to a 3D stimulus.
20 emmetropic subjects (mean age 20.4±1.9 years) participated with informed consent. All subjects had vision of 6/5 or better, and normal binocular function. The 3D stimulus was created using Crystaleyes shutter goggles synchronised with a CRT monitor placed at 33cm. This creates an accommodation stimulus fixed at 3.00D, and a vergence stimulus varying from 0 to 5MA. Subjects viewed the stimulus for 20 minutes. Accommodation was measured using a Shin Nippon SRW-5000 infrared optometer (mean of 20 consecutive readings) and vergence was measured continuously using the Eyetrace 300 infrared, limbal reflection eyetracker. Accommodation and vergence levels were measured pre-exposure and at three minute intervals post-exposure for one hour.
Significant vergence adaptation was found post-exposure (p<0.01). The magnitude of vergence adaptation ranged from -2MA to +4MA. The time course showed considerable inter-subject variation with around 50% of subjects failing to return to baseline within the recording period. Adaptation of vergence was found in both the convergent and divergent directions and was not correlated to baseline open loop levels. No significant changes in open-loop accommodation were found.
Adaptive changes in the vergence system can be induced by relatively short durations of exposure to 3D displays. The magnitude of vergence adaptation identified would be sufficient to produce asthenopia/diplopia in susceptible individuals. These factors may be an important consideration with the increasing use of 3D display technology.
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