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KMID : 1159320170190040411
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Korean Journal of Vision Science
2017 Volume.19 No. 4 p.411 ~ p.422
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A Study on Measurement of Fusional Vergence Reserve Amount Using Digital Camera
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Choi Min-Kyu
Ko Kyung-Ho
Jeon In-Chul
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Abstract
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Purpose: The purpose of this study was to investigate the method of measuring the fusional vergence amount by analyzing the image of the eyes changed with the application of the prism using a digital camera and to evaluate the significance of this method with a conventional subjective measurement method.
Methods: The subjects were 30 adults (mean age 23.77 ± 1.52 years) with corrected visual acuity of 1.0 or more and were measured negative fusional vergence (NFV) and positive fusional vergence (PFV) three times, respectively, using a step vergence method with a prism bar at distance and near. When measuring fusional vergence, each prism stage was photographed using a Canon 6D DSLR camera and a 100mm macro lens. At the same time, we recorded subjective break and recovery points. Finally, we measured that pupillary distance (PD) on photograph of each step of prism diopter and convert them to graph. The significance was identified by comparing subjective and objective values.
Results: In the case of the NFV measurement, the graph showed a steady increase in the pupillary distance change measured after photographing, and a graph slope change at the point reported as the break and recovery points. In the case of PFV measurement, the PD decreased steadily, and the slope of the graph was changed at the point reported as the separation point and the recovery point. The mean value of the NFV at distance was that objective ‘12.63±5.48?’, subjective ‘11.41±3.88?’ at the break point, objective ‘9.15±4.12?’, subjective ‘8.11±3.47?’ at the recovery point. For near NFV break points were that objective ‘16.74±4.01?’, subjective ‘15.93±4.66?’ and recovery points were that objective ‘12.55±3.43?’, subjective ‘11.91±3.90?’. The break points of distance PFV were that objective ‘18.52±4.84?’, subjective ‘18.58±5.73?’ and the recovery points were that objective ‘3.36±3.89?’, subjective ‘13.17±4.34?’. The break points of near PFV were that objective ‘22.85±6.33?’, subjective ‘22.96±6.21?’ and the recovery points were that objective ‘17.13±4.61?’, subjective ‘17.48±5.37?’. These were not statistically significant.
Conclusions: There was no statistically significant difference of the measured values between that the objective measurements using a digital camera and the subjective measurements using a prism bar. Therefore, it would be useful to measure the convergence reserve in infants and persons with disabilities who can not perform self - examinations using a digital camera. It is thought that the method of measuring fusional vergence range using a digital camera is useful for the measurement of infants and the disabled who can not be measured by subjective method.
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KEYWORD
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Fusional reserve, Objective measurement, Fusional vergence, Pupillary distance, Step vergence method
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