The effect of ocular rigidity upon the characteristics of saccadic eye movements.
Invest Ophthalmol Vis Sci
; 55(3): 1251-8, 2014 Mar 04.
Article
en En
| MEDLINE
| ID: mdl-24481265
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.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Movimientos Sacádicos
/
Presión Intraocular
Límite:
Adolescent
/
Adult
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Female
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Humans
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Male
Idioma:
En
Revista:
Invest Ophthalmol Vis Sci
Año:
2014
Tipo del documento:
Article
País de afiliación:
Reino Unido
Pais de publicación:
Estados Unidos