A Comprehensive Assessment of Visual Impairment in a Population of Older Americans

A comprehensive assessment of visual impairment in a population of older Americans: the SEE study.

Aim: To examine how stereoacuity changes with age as measured by a variety of stereotests. Methods: Stereoacuity has been measured in 60 normal subjects aged 17–83 years by a single observer using TNO, Titmus, Frisby near, and Frisby-Davis distance stereotests. Motor fusion was measured at ⅓ metre and 6 metres. Results: Overall stereoacuity measured by all tests showed a mild decline with age (p Conclusions: Although subjects showed some decline in stereoacuity with age by all tests, the large drop in stereoacuity seen in some older subjects using the TNO test was probably due to difficulty overcoming the dissociative effect of the test rather than a true reduction in cortical disparity detection. Results of random dot stereotests should be interpreted with caution in older patients, particularly with respect to their ability to perform everyday visual tasks.

https://bjo.bmj.com/content/bjophthalmol/90/1/91.full.pdf

Effect of age on adult stereoacuity as measured by different types of stereotest

Stereopsis has been one of the most popular fields of vision research for well over a century and is routinely measured in clinical practice, yet its functional significance has been largely neglected. Stereopsis is disrupted by blur, amblyopia and strabismus and is of potential value as a means of indirect screening for visual disorders in childhood. However, evidence for the functional effects of stereoscopic deficits is sparse. Recent investigations indicate that binocularity is an advantage in certain tasks, especially in the comprehension of complex visual presentations and those requiring good hand-eye coordination. The assumption derived from the evolutionary theory that stereopsis represents an adaptation by primates to arboreal life needs to be questioned. While the functional aspects of stereopsis are still not fully understood the direction that future research should take to unravel this important issue is apparent.

/pdf/does-stereopsis-matter-in-humans-1gd80a915g.pdf

Does stereopsis matter in humans

The effect of aging on contour integration.

This study reports the prevalence of defective stereopsis in an elderly population. Of 728 individuals over the age of 65 who attempted a Frisby stereotest, only 27% had full stereopsis and 29% had no stereopsis. In the elderly population defective stereopsis is a common finding in the absence of any other ocular morbidity. The prevalence of defective stereopsis increased with age. This finding was noted as a part of a survey of eye health of elderly people living in an inner city. The finding was not associated with any symptoms. The significance of this finding is discussed.

/pdf/stereopsis-and-ageing-1layke7yw8.pdf

Stereopsis and ageing.

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Stereopsis and ageing.