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accommodative power acuteness of vision ametropia amount amplitude of accommodation anisometropia ascertain asthenopia atropine axis vert bi-focals binocular vision candidate cause centre ciliary muscle Colour sense concave glass convex glass cornea curvature cycloplegic cylinder defect deviation diffusion circles dioptres diplopia disc distance distant vision Donders emmetropia emmetropic error of refraction examination exophoria external focal focus-glass front fundus fusion headache heterophoria high myopia homatropine 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 principal focus prism produced punctum remotum pupil range of accommodation rays passing rectus represents retina retinoscopy right angles right eye shadow side spasm spherical strabismus strain surface symptoms of eyestrain treatment trial frame vergence visual axes
Page 6 - Radian is the angle subtended, at the centre of a circle, by an arc equal in length to the radius...
Page 227 - A candidate is disqualified unless both eyes are emmetropic, his acuteness of vision and range of accommodation being perfect. 2. A candidate is disqualified by any imperfection of his colour sense. 3. Strabismus, or any defective action of the exterior muscles of the eyeball, disqualifies a candidate for these branches of service.
Page 227 - D lens, or some lower power. 2. A candidate is disqualified by any imperfection of his colour sense. 3. Strabismus, or any defective action of the exterior muscles of the eyeball, disqualifies a candidate for this branch of service.
Page 226 - 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 distance of 20 feet; and Snellea's Optotypi for the test for near vision without glasses, at any distance selected by the candidate.
Page 221 - 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 ordinary daylight.
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 224 - ... staphyloma, may be admitted into the Service, provided the ametropia in either eye does not exceed 2-5 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 222 - 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.