The Errors of accommodation and refraction of the eye and their treatmentBailliere, Tindall and Cox, 1918 - 243 pages |
Common terms and phrases
accommodative power acuteness of vision ametropia amount amplitude of accommodation anisometropia atropine axis vert bi-focals binocular vision candidate cause centre ciliary muscle Colour sense concave glass convergence convex glass cornea curvature cycloplegia cycloplegic cylinder defect Demy 8vo deviation dioptres diplopia disc distance distant vision Donders Edition emmetropia emmetropic error of refraction examination exophoria external focus-glass front fundus fusion headache heterophoria high myopia homatropine horizontal hyperopia hyperopic insufficiency internal recti inverse astigmatism latent divergence lens lenses light Maddox metre angle myope myopia nearer nerve normal eye object oblique observed eye ophthalmometer shows ophthalmoscope parallel rays patient point of reversal position posterior Presbyopia presbyopic Price principal focus prism produced punctum remotum pupil range of accommodation rays passing rectus represents retina retinoscopy right eye shadow side spasm spherical strabismus strain surface symptoms of eyestrain tion treatment trial frame vergence visual axes
Popular passages
Page 6 - Radian is the angle subtended, at the centre of a circle, by an arc equal in length to the radius...
Page 223 - DEPARTMENT. 1. If myopia in one or both eyes exists, a candidate may be passed, provided the ametropia does not exceed...
Page 222 - D, and no active morbid changes of choroid or retina be present. 3. A candidate who has a defect of vision arising from nebula of the cornea is disqualified if the sight of either eye be less than...
Page 226 - SPECIAL DUTY. Candidates for special duty under Government must possess such an amount of acuteness of vision as will, without hindrance, enable them to perform the work of their office for the period their appointment may last. In all cases of imperfection of colour sense a note will be made on the candidate's paper.
Page 100 - ... with that concave glass whose focal length is equal to the distance of the far point from the eye, and the converse is true; the measurement of myopia is that concave glass with which the myopic eye sees distinctly objects at a distance, and its focal length is equal to the distance of the myope's far point from the eye.
Page 220 - Inability to distinguish the principal colours will not be regarded as a cause for rejection, but the fact will be noted in the proceedings and the candidate will be informed.
Page 224 - 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 the above rules, may exclude a candidate for admission into the service.
Page 224 - ... 6. Squint or any morbid condition, subject to the risk of aggravation or recurrence, in either eye, may cause the rejection of a candidate. The existence of imperfection of colour sense will be noted on the candidate's papers.
Page 223 - Artificers.* 1. If myopia in one or both eyes exists, a candidate may be passed, provided the ametropia does not exceed 2'5 D, and if with correcting glasses, not exceeding 2'5 D, the acuteness of vision in one eye equals 6/9 and in the other 6/6, there being normal range of accommodation with the glasses.
Page 224 - D ; the acuteness of vision in one eye, when corrected being equal to £, and in the other eye£, together with normal range of accommodation with the correcting glasses, there being no evidence of progressive disease in the choroid or retina. 3. A candidate having total hypermetropia not 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 §• with + 4 D or any lower power.