Intermediate visual acuity of presbyopic individuals with and without distance and bifocal lens corrections.

Welsh, Kenneth W.; Rasmussen, Paul G.; Vaughan, John A.; Civil Aeromedical Institute

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Intermediate visual acuity of presbyopic individuals with and without distance and bifocal lens corrections.

1977-03-01
By Welsh, Kenneth W. ; Rasmussen, Paul G. ; Vaughan, John A.

[PDF-504.28 KB]

English

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Creators:

Welsh, Kenneth W. ; Rasmussen, Paul G. ; Vaughan, John A.

Welsh, Kenneth W. ; Rasmussen, Paul G. ; Vaughan, John A. Less -
Corporate Creators:

Civil Aeromedical Institute
Corporate Contributors:

United States. Office of Aviation Medicine
Subject/TRT Terms:

[+]

Aged Air Pilots Contact Lenses Depth Perception Distance Perception Eye Eye--Refractive Errors Eyeglasses Older People Vision Vision--Testing Vision Tests Visual Acuity
Publication/ Report Number:

FAA-AM-77-7 ; DOT/FAA/AM-77/7

FAA-AM-77-7 ; DOT/FAA/AM-77/7 Less -
Resource Type:

Tech Report
Geographical Coverage:

United States
Corporate Publisher:

Civil Aerospace Medical Institute
Abstract:

Visual acuity was determined at the intermediate range for older individuals with various combinations of ocular refractive error (nine subcategories) and accommodative power (three subcategories). Subjects (N=249) read numerals ranging in size to measure visual acuity from 20/80 to 20/15 at 51, 76, and 102 cm (20, 30, and 40 in) with 50 fL luminance. Monocular visual acuity scores were determined both with the subject's optimum spectacle lens correction for distance vision (6 m, 20 ft) and near vision (0.4 m, 16 in) and without lenses.

For subjects with low accommodative power, neither the distance nor the near lens correction provides normal vision throughout the intermediate range. At 102 cm vision is better with the distance correction, while at 51 cm visions is better with the near correction. At 76 cm neither lens offers normal vision.
Format:

PDF
Collection(s):

FAA Civil Aerospace Medical Institute US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:87a2f5280e5857bd660b84ec72c5a02ebd14a5886ab6300ebc9568f25f75ea72
Download URL:

https://rosap.ntl.bts.gov/view/dot/21100/dot_21100_DS1.pdf
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Intermediate visual acuity of presbyopic individuals with and without distance and bifocal lens corrections.

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