Readability of alphanumeric characters having various contrast levels as a function of age and illumination mode.

Welsh, K.W.; Rasmussen, P.G.; Vaughan, J.A.; Civil Aeromedical Institute

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Readability of alphanumeric characters having various contrast levels as a function of age and illumination mode.

1977-07-01
By Welsh, K.W. ; Rasmussen, P.G. ; Vaughan, J.A.

[PDF-406.95 KB]

English

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Creators:

Welsh, K.W. ; Rasmussen, P.G. ; Vaughan, J.A.

Welsh, K.W. ; Rasmussen, P.G. ; Vaughan, J.A. Less -
Corporate Creators:

Civil Aeromedical Institute
Corporate Contributors:

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

[+]

Aeronautical Charts Age Air Pilots Brightness Dark Adaptation Depth Perception Distance Perception Human Subject Testing Lighting Luminance Luminescence Night Vision Vision Vision--Testing Vision Tests Visual Perception
Publication/ Report Number:

FAA-AM-77-13 ; DOT/FAA/AM-77/13

FAA-AM-77-13 ; DOT/FAA/AM-77/13 Less -
Resource Type:

Tech Report
Geographical Coverage:

United States
Corporate Publisher:

Civil Aerospace Medical Institute
Abstract:

Readability data of alphanumeric characters that vary in figure-to- ground contrast ratio were obtained from 36 subjects; 12 subjects were placed in each of three age groups (20-25 yr, 40-45 yr, and 60-65 yr). Minimum illuminance required to identify all contrast combinations was determined at a viewing distance of 40 cm (15.7 in) under dim white and red illumination.

Subjects identified all characters while viewing through an artificial pupil (2.0mm) and, when required, while wearing a spectacle lens correction. Data indicate a significant difference in luminance values for successive changes in contrast ratio under both illumination modes. Under red illumination, threshold luminance values showed a significant trend with age for all five contrast levels. Under white illumination, significant trends were indicated for three of the five contrast levels. With reference to the younger group, individuals in the middle- aged and older groups required an average luminance increase of 18 and 63 percent respectively for equivalent readability scores under white illumination. Under red lighting, corresponding values were 18 and 58 percent.
Format:

PDF
Collection(s):

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

[+]

urn:sha256:0e97a88ffaa74b4692f9e1a0f6a5005b673332bf1e6cf6f6f501f559da83d792
Download URL:

https://rosap.ntl.bts.gov/view/dot/21106/dot_21106_DS1.pdf
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Readability of alphanumeric characters having various contrast levels as a function of age and illumination mode.

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