TY - JOUR
T1 - The effect of ocular rigidity upon the characteristics of saccadic eye movements
AU - Alhazmi, Mohammed
AU - Seidel, Dirk
AU - Gray, Lyle S.
N1 - Copyright Association for Research in Vision and Ophthalmology (and authors)
Only 03/2014 available for pub date - used last date of month 6/03/2020 TM
Acceptance from VoR 6/03/20202 TM
PY - 2014/3/31
Y1 - 2014/3/31
N2 - Purpose.: To determine whether variation in ocular rigidity (a quantity that describes the elastic properties of the globe) affects the characteristics of horizontal saccadic eye movements.Methods.: Thirty-three young, visually healthy subjects participated with informed consent in the study. Axial length was measured using the IOLMaster ocular biometer. Ocular rigidity coefficients were determined using Schiotz tonometry. Horizontal saccades were stimulated randomly to 40° in 10° steps. Eye movements were recorded continuously at a sampling rate of 60 Hz using the Viewpoint video-eyetracker.Results.: Peak velocity increased significantly with increasing ocular rigidity (F [2,263]= 30.635, P < 0.001). Time to peak velocity (F [2,263]= 27.723, P < 0.001) and total response time (F [2,263]= 21.133, P < 0.001) decreased significantly with increasing ocular rigidity. Ocular rigidity was significantly positively correlated with peak velocity (R 2 = 0.67, P <0.001), and significantly negatively correlated with time to peak velocity (R 2 =0.64, P < 0.001), and total response time (R 2 =0.62, P < 0.001).Conclusions.: The known relationship of ocular rigidity with myopia can be extended to shorter hyperopic eyes, which are found to have higher ocular rigidity. The dynamic characteristics of saccadic eye movements are found to vary systematically with ocular rigidity. These findings suggest that the structural characteristics of the eye are an important factor in determining dynamic characteristics of eye movements.
AB - Purpose.: To determine whether variation in ocular rigidity (a quantity that describes the elastic properties of the globe) affects the characteristics of horizontal saccadic eye movements.Methods.: Thirty-three young, visually healthy subjects participated with informed consent in the study. Axial length was measured using the IOLMaster ocular biometer. Ocular rigidity coefficients were determined using Schiotz tonometry. Horizontal saccades were stimulated randomly to 40° in 10° steps. Eye movements were recorded continuously at a sampling rate of 60 Hz using the Viewpoint video-eyetracker.Results.: Peak velocity increased significantly with increasing ocular rigidity (F [2,263]= 30.635, P < 0.001). Time to peak velocity (F [2,263]= 27.723, P < 0.001) and total response time (F [2,263]= 21.133, P < 0.001) decreased significantly with increasing ocular rigidity. Ocular rigidity was significantly positively correlated with peak velocity (R 2 = 0.67, P <0.001), and significantly negatively correlated with time to peak velocity (R 2 =0.64, P < 0.001), and total response time (R 2 =0.62, P < 0.001).Conclusions.: The known relationship of ocular rigidity with myopia can be extended to shorter hyperopic eyes, which are found to have higher ocular rigidity. The dynamic characteristics of saccadic eye movements are found to vary systematically with ocular rigidity. These findings suggest that the structural characteristics of the eye are an important factor in determining dynamic characteristics of eye movements.
KW - ocular rigidity, axial length, saccadic eye movements, peak velocity
U2 - 10.1167/iovs.13-13688
DO - 10.1167/iovs.13-13688
M3 - Article
VL - 55
SP - 1251
EP - 1258
JO - Investigative Ophthalmology & Visual Science
JF - Investigative Ophthalmology & Visual Science
SN - 0146-0404
IS - 3
ER -
