The Errors of Accommodation and Refraction of the Eye and Their Treatment: A Handbook for Students |
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Common terms and phrases
accom accommodation power acuteness of vision ametropia ametropic amplitude of accommodation anisometropia asthenopia astig atropine axis vert become binocular vision candidate cause centre ciliary muscle concave glass convergence convergence insufficiency convex glass cornea correcting glass curvature cycloplegic cylinder defect diffusion circles dioptres diplopia disc distance distant vision emmetropia emmetropic examination external eyestrain fatigue focussed front fundus headache high myopia homatropine horizontal hyperopia hyperopic hyperopic eye insufficiency internal recti latent divergence lens lenses light Maddox metre angle modation muscular asthenopia myope myopia nearer normal eye object oblique observed eye ophthalmometer shows ophthalmoscope parallel rays patient plane mirror point of reversal position posterior presbyopia presbyopic principal focus prism produce punctum remotum pupil rays passing rectus refraction represents retina retinoscopy right angles right eye shadow side spectacles spherical strabismus strain surface symptoms tion treatment trial frame vergence visual axes
Popular passages
Page 209 - ... 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 206 - Snellen'a test types will be used for determining the acuteness of vision.) Squint, inability to distinguish the principal colours, or any morbid condition, subject to the risk of aggravation or recurrence in either eye, will cause the rejection of a candidate. . — The following additional points will then be observed : — (a.) That his hearing is good.
Page 24 - The immediate antecedent of an attack is a condition of unstable equilibrium and gradually accumulating tension in the parts of the nervous system more immediately concerned, while the paroxysm itself may be likened to a storm, by which this condition is dispersed and equilibrium for the time restored.
Page 208 - D, and that the sight of one eye equals § and of 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 one eye be less than jj.
Page 207 - ... in the other ; there being no morbid changes in the fundus of either eye. 2. Cases of myopia, however, with a posterior 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 94 - ... 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 104 - Schoolmasters should teach more, that is, they should explain and impart knowledge by demonstrations and simple lectures, and reduce as much as possible the time spent in " home preparation," which is usually work done by bad light and when the student is physically and mentally tired. Even in the nursery the greatest care should be taken. The little ones should...
Page 208 - D ; the acuteness of vision in one eye, when corrected, being equal to -J, 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 JJ-, with + 4 D or any lower power.
Page 208 - ... with + 4 D or any lower power. 4. Hypermetropic astigmatism does not disqualify a candidate for the service, provided the lens or combined lenses required to cover the error of refraction do not exceed 4 D, and that the sight of one eye equals £ and of the other £ , with or without such lens or lenses.
Page 209 - 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.