While refraction is a science based on mathematical principles and theoretically very exact, yet there are other questions involved besides that of measuring the radius of curvature, finding the far and near points, range of accommodation, etc.
What I shall have to say in this short paper will not be new to many, but it is a phase of refraction about which very little has been said or written. Hence my excuse for presenting this paper.
Has psychology any practical bearing on the subject of refraction? In many cases perhaps very little, while in other cases quite a good deal. If all brains were of the same quality, all minds trained to think alike, all nervous systems equally well balanced, every individual reared in a pure atmosphere with proper and healthful environments, refraction would in a measure be reduced to the simple question of accurate observation and correct measurements. It
LEDBETTER SL. THE PSYCHOLOGIC ASPECT OF REFRACTION. JAMA. 1911;LVII(16):1283–1285. doi:10.1001/jama.1911.04260100109016
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