The errors of accommodation and refraction of the eye and their treatment : a handbook for students / by Ernest Clarke.

  • Ernest Clarke
Date:
1911
Catalogue details

Licence: In copyright

Credit: The errors of accommodation and refraction of the eye and their treatment : a handbook for students / by Ernest Clarke. Source: Wellcome Collection.

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

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    in one eye equals ^, there being normal range of accommodation with the glasses. 2. Myopic astigmatism does not disqualify a candidate, pro- vided the lens, or the combined spherical and cylindrical lenses, required to correct the error of refraction does not exceed 3.5 d ; the acuteness of vision in one eye, when corrected, being equal to ^, and in the other ^, together with normal range of accommo- dation with the correcting glasses, there being no evidence of progressive disease in the choroid or retina, 3. A candidate having total hypermetropia net exceeding 4 d is not disqualified, provided the sight in one eye (when under the influence of atropine) equals |. and in the other eye equals t-, with + 4 D glasses, or any lower power. 4. Hypermetropic astigmatism does not disqualify, piovided the lens or combined lenses required to cover the error of refrac- tion do not exceed 4 d, and that the sight of one eye equals If, and the other ^, with or without such lens or lenses. 5. A candidate having a defect of vision arising from nebula of the cornea is disqualified if the sight of that eye be less than /o. In such a case the better eye must be emmetropic. Defects of vision arising from pathological or other changes in the deeper structures of either eye which are not referred to in these rules may exclude a candidate. 6. Squint or any morbid condition, subject to the risk of aggravation or recurrence, in either eye, may cause the rejection of a candidate. Any imperfection of the colour sense is a dis- qualification for appointment to the Engineering Branch of the Railway Department, or as Assistant Superintendent in the Traffic Department. In all other cases a note as to any imperfec- tion of colour sense will be made on the candidate's papers. The Indian Medical Service and the Police Depaftment. 1. Squint, or any morbid condition of the eyes or of the lids of either eye liable to the risk of aggravation or recurrence, will cause the rejection of the candidate. 2. The examination for determining the acuteness of vision includes two tests—one for distant, the other for near, vision. The army test-types will be used for the test for distant vision, without glasses, except where otherwise stated below, at a dis- tance of 20 feet ; and Snellen's Optotypi for the test for near vision, without glasses, at any distance selected by the candidate. Each eye will be examined separately, and the lids must be kept wide open during the test. The candidate must be able to read the tests without hesitation in oidinary daylight. 3. A candidate possessing acuteness of vision, according to one of the standards herein laid down, will not be rejected on account of an error of refraction, provided that the error of refraction, in the following cases, does not exceed the limits mentioned—viz. : [a] In the case of myopia, that the error of refraction does not exceed 2.5 d ; {b) that any correction for astigmatism does not exceed 2.t; d ; and, in the case of myopic