Effects of Pupil Diameter on Light Detection and Temporal Modulation

Rachel S Li; Andrew W Siu; Johnny C Liyu; Elice C Chan

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Effects of Pupil Diameter on Light Detection and Temporal Modulation

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Purpose: This study compared the effects of pupil variation on light detection and temporal modulation across the central visual field.Methods:Light detection sensitivity (LDS) and low flickering frequency (6Hz) temporal modulation sensitivity (TMS) of 20 young subjects were measured from the central visual field of the right eyes using an automated perimeter (Medmont M600). The measurements were taken under 3 artificial pupils, I.e. 3 mm, 4.3 mm and 6 mm diameters.The sensitivities were grouped and averaged for different retinal eccentricities(3°, 6°, 10° and 15°).Results:TMS and LDS were reduced with increasing retinal eccentricities( P ＜ 0.001)and decreasing pupil diameters( P ＜ 0.001). TMS collected from all pupil diameters were significantly different from each other( P ＜ 0.001). Similarly, LDS under 3 mm pupil was statistically different from those of 4.3 mm and 6 mm(P ＜ 0.003). Comparison of the hills of vision showed that pupil variation resulted in significantly different slopes (P=0.001).The slopes were also found to be significantly different between TMS and LDS (P=0.012).Conclusions: The data showed that dilated pupil resulted in significantly higher sensitivities than those of smaller pupil for both visual functions. The difference in the slopes of hills of vision also suggested that the variation in retinal illumination affected the visual responses differently at various retinal eccentricitities for TMS and LDS.

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来源
《眼科学报》 |2003年第3期|137-141|共5页
作者
Rachel S Li; Andrew W Siu; Johnny C Liyu; Elice C Chan;
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作者单位

Department of Optometry and Radiography;

The Hong Kong Polytechnic University Kowloon;

Hong Kong SAR;

China;

Corresponding author. Andrew W Siu;

PhD. Department of Optometry and Radiography;

The Hong Kong Polytechnic University Kowloon;

HongKong SAR;

China;

Department of Optometry and Radiography;

The Hong Kong Polytechnic University Kowloon;

Hong Kong SAR;

China;

Department of Optometry and Radiography;

The Hong Kong Polytechnic University Kowloon;

Hong Kong SAR;

China;

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原文格式 PDF
正文语种 chi
中图分类眼机能检查法;
关键词
瞳孔直径; 光觉检查; 中央视野; 闪烁频率;

机译：瞳孔;光检测;时间调制;视觉敏感度;视野;

Effects of Pupil Diameter on Light Detection and Temporal Modulation

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