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Effect of age on the interaction between the AC/A and CA/C ratios.
- Source :
-
Ophthalmic & Physiological Optics . Sep95, Vol. 15 Issue 5, p451-455. 5p. 6 Graphs. - Publication Year :
- 1995
-
Abstract
- A number of previous studies have examined the effects of age and the development of presbyopia on either the accommodative convergence to accommodation (AC/A) or convergent accommodation to convergence (CA/C) ratios. However, changes in the interaction of these oculomotor crosslinks with increasing age have received relatively little attention, especially over a wide age distribution. Accordingly, the present study examined both crosslink ratios in 42 subjects ranging from 22 to 65 years of age. A dual haploscope-optometer was used to measure accommodation and vergence. The response AC/A ratio showed a small but significant positive correlation with age in those subjects under 45 years of age, while no significant correlation was observed between the stimulus AC/A ratio and age for all subjects. The CA/C ratio exhibited a significant negative correlation with age for all subjects. Furthermore, a trend was observed for lower CA/C findings to be associated with higher response AC/A ratios. However, the two ratios were inversely but not reciprocally related, with the mean difference between the CA/C ratio and the reciprocal of the response AC/A ratio being significantly different from zero. These age-related changes in the output of the oculomotor crosslinks provide further evidence of the continual oculomotor adaptation that occurs concurrent with the loss of accommodative responsivity. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02755408
- Volume :
- 15
- Issue :
- 5
- Database :
- Academic Search Index
- Journal :
- Ophthalmic & Physiological Optics
- Publication Type :
- Academic Journal
- Accession number :
- 36448938
- Full Text :
- https://doi.org/10.1016/0275-5408(95)00061-H