The loss of efficiency sustained by the eye in an unfavorable lighting situation is muscular, not retinal¶
Claim · All claims
Evidence · 1 study · causalr2·q3
Currency · newest study 1917 · not yet checked against its sources · not reviewed by a person
Subclaims¶
Reading the evidence codes
q is the design tier, i the impact, n the sample, and the kind with its r
the rigour judged within that kind: what each code means.
This claim: no standardized effect is recorded in observations/ for it yet, so no benchmark reading is possible.
q3 i? Retinal efficiency, tested by discrimination of color and brightness and by rates of exhaustion and recovery, differs little across lighting systems even after as many as ten hours of work. → C. E. Ferree and Gertrude Rand 1917
Evidence¶
C. E. Ferree and Gertrude Rand 1917¶
C. E. Ferree and Gertrude Rand. (1917). The Power of the Eye to Sustain Clear Seeing Under Different Conditions of Lighting. The Journal of Educational Psychology. https://doi.org/10.1037/h0072369
q3 · i? · causal · r2
Supplementary physiological tests accompanying the acuity-sustain program. The retina was found to lose little, if any, more efficiency under one lighting system than another, tested after as many as ten hours of work under the system in question.
"The loss of efficiency sustained by the eye in an unfavor- able lighting situation seems to be muscular, not retinal. The retina has been found to lose little, if any, more in efficiency under one than another of the lighting systems employed"
Discussion¶
Related Claims¶
- Across all conditions tested, a lighting condition's tendency to cause loss of visual efficiency correlates closely with its tendency to produce ocular discomfort — related
- When light is well distributed and diffuse with no extremes of surface brightness, the eye is practically independent of illumination intensity within ordinary lighting ranges — related
- Indirect systems and semi-indirect systems with high-density reflectors produced the best results for sustaining clear seeing among the artificial lighting systems tested — related
- Extremes of surface brightness in the field of vision are the most important causes of eye discomfort and loss of efficiency in contemporary lighting systems — related
- Normal sense organs possess surplus discriminative efficiency beyond ordinary practical demands — a broader claim this one bears on
Page metadata
| Field | Value |
|---|---|
type |
claim |
id |
lighting-efficiency-loss-muscular-not-retinal |
title |
The loss of efficiency sustained by the eye in an unfavorable lighting situation is muscular, not retinal |
description |
The loss of efficiency sustained by the eye in an unfavorable lighting situation is muscular, not retinal |
status |
review |
evidence_strength |
moderate |
newest_evidence |
1917 |
generated |
by process:wiki-ingest on 2026-10-25 |
trust |
unverified — no one has confirmed this page's content |
sources |
1 — c-e-ferree-and-gertrude-rand-1917 |
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