The effect of eye size and ocular rigidity upon saccadic eye movements
Conference Paper
Alhazmi, Mohammed . 2011
نوع عمل المنشور:
Conference Poster
رابط المنشور على الويب:
اسم المؤتمر:
British Congress of Vision Science (BCOVS),
تاريخ المؤتمر:
الجمعة, أيلول (سبتمبر) 16, 2011
المنظمة الراعية:
Aston University
مستخلص المنشور:
Purpose: The purpose of this study is to determine whether dif- ferences in eye size or ocular rigidity affect the characteristics of saccadic eye movements.
Methods: Thirty-three subjects (mean age 23.52 ± 5.11 years) participated with informed consent in the study. Axial length was measured using the IOLMaster (www.zeiss.co.uk) and ranged from 21.3 to 27.7 mm. Ocular rigidity coefficients ranged from 0.013 to 0.019, as determined using the Schiotz tonometer. Saccadic eye movements were stimulated randomly to 40° right and left in 10° steps using high contrast targets. Eye movements were recorded continuously at a sampling rate of 60 Hz using the Viewpoint video- eyetracker (www.arringtonresearch.com). For data analysis subjects were divided into three equal groups according to axial lengths.
Results: Axial length was significantly negatively correlated with ocular rigidity (r2 = 0.78, p < 0.001). Total response time was signif- icantly lower for the group with the shortest axial lengths (F2,263 = 10.8, p < 0.001). The difference in total response time was found for abductive movements only (F2,263 = 4.1, p = 0.044) and was found to be greater with increasing stimulus size (F3,263 = 45.9, p < 0.001). No significant variation with axial length was found for either latency or time to peak velocity.
Conclusions: Ocular rigidity reduces with increasing eye size. Abductive eye movements are completed more quickly where eye size is relatively small. These results suggest that eye size can have a significant effect upon the dynamic characteristics of saccadic eye movements.