Across all conditions tested, a lighting condition's tendency to cause loss of visual efficiency correlates closely with its tendency to produce ocular discomfort¶

Claim · All claims
Evidence · 1 study · causal r2 · q3
Currency · newest study 1917 · not yet checked against its sources · not reviewed by a person

Subclaims¶

q3 i? A rather close correlation obtains between a lighting condition's tendency to cause loss of visual efficiency and its tendency to produce ocular discomfort. → 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

Comparison across all tested lighting situations of the acuity-sustain results with discomfort timings. Discomfort was estimated by the time required for just noticeable discomfort to arise with the eye working and at rest, checked by mean variation.

"In all of the conditions tested a rather close correlation is found to obtain between the tendency of a given lighting condition to cause loss of visual efficiency and to produce ocular discomfort."

Discussion¶

Related Claims¶

• 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
• 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
• The loss of efficiency sustained by the eye in an unfavorable lighting situation is muscular, not retinal — related