Stereoscopic treatment of heterophobia and heterotropia : designed to accompany the phoro-optometer stereoscope and the Wells selection of stereoscopic charts / by David W. Wells.

  • Wells, David W.
Date:
1912
Catalogue details

Licence: In copyright

Credit: Stereoscopic treatment of heterophobia and heterotropia : designed to accompany the phoro-optometer stereoscope and the Wells selection of stereoscopic charts / by David W. Wells. Source: Wellcome Collection.

Provider: This material has been provided by UCL Library Services. The original may be consulted at UCL (University College London)

    18/86 (page 12)
    CHAPTER II. ORTHOPHORIA. —HETEROPHORIA. — STEVENS ' PHORO- METER. —SAVAGE^ MONOCULAR PHOROMETER. — WELLS' HANDY PHOROMETER.—PRENTICE- WILLIAMS ' PRISOMETER. —SCREEN TEST.—DUC- TION. — CAUSES OF HETEROPHORIA. — SYMPTOMS OF HETEROPHORIA. Orthophoria—right tending—is the condition where both eyes tend to look at the same point at all distances. Those who believe in the dis- turbing influence of kataphoria and anarjhoria would dissent from calling this a condition of perfect muscle balance. While orthophoria necessitates normal orbits, proper strength, in- sertion and nerve supply of muscles, it is also influenced by other factors. Sight requires ac- commodation for all distances from ten inches to infinity, and fixation of the two eyes upon this spot. This is a most beautiful example of coor- dination, but is easily disturbed by an abnor- mality of accommodation, which may be in the ciliary muscle itself, or in a refractive error which necessitates abnormal accommodation for its correction. It therefore follows that muscle tests should be made with the patient wearing his correcting