Title

Effect Of Flashes Of Light On Night Visual Acuity

Date

1953

Index Abstract

Coming Soon

Photo Quality

Complete

Report Number

WADC TR 52-10 Part 2

Creator

Fry, Glenn A.

Allen, Merrill J.

Corporate Author

Ohio State University Research Foundation

Laboratory

Aero Medical Laboratory

Extent

42

PB Number

PB107339

NTRL Accession Number

AD013834

Identifier

AD0013834

AD Number

13834

Access Rights

Unknown

Distribution Classification

1

DTIC Record Exists

No

Distribution Change Authority Correspondence

None

Distribution Conflict

Fix

Abstract

Experiments were conducted to investigate a satisfactory method of predicting the course of constriction of the pupil of a dark-adapted eye when exposed to a flash of any duration or a series of flashes involving a complex distribution of brightness in the visual filed. Two aspects of the problem are considered. If the flash lasts longer than the latent period for pupil constriction, the pupil constriction will affect the amount of light reaching the retina during the latter portion of the flash. Also after the flash, the pupil does not return back to its normal size until after a considerable period of time. The investigation indicated that responses of a dark-adapted eye are proportional to the total amount of light involved (brightness x area x time). This conclusion holds roughly for the central region of the field of view up to 35 deg out from the primary line of sight and for flashes up to 0.2 sec. For flashes longer than 0.2 sec, the effect of varying duration was the same as that of varying brightness, and allowance must be made for the effect of the pupil constriction itself.

Report Availability

Full text available

Date Issued

1953-01

Provenance

Hunt Library, Embry-Riddle Aeronautical University

Type

report

Format

1 online resource