The Dark Focus of the Human Eye and Its Relationship to Age and Visual Defect
- 1 February 1983
- journal article
- research article
- Published by SAGE Publications in Human Factors: The Journal of the Human Factors and Ergonomics Society
- Vol. 25 (1) , 85-92
- https://doi.org/10.1177/001872088302500108
Abstract
The effects of age and ametropia (nearsightedness or farsightedness) on the dark focus of visual accommodation have not been extensively investigated. Participant pools of students are generally screened and their vision "standardized" by testing them while they wear their corrective lenses. In this study, nearsighted and farsighted subjects were measured for their near points, far points, and dark focuses. It was found that the more nearsighted the eye the larger the dark focus shift. Age was also found to have a relationship to the dark focus. Older individuals tended to have a smaller dark focus shift, and the dark focus was found to recede with age at roughly the same rate as the far point.Keywords
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