Clinics in Optometry; A Compilation of Eye Clinics Covering Fully All Errors of Refraction and Anomalies of Muscles, with Methods of Examination, Test - Softcover

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This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1907. Not illustrated. Excerpt: ... Inspection of Spectacles and Eyeglasses and Neutralization of Lenses clinic No. 36 It is a matter of prudence and importance that you should carefully examine the finished product as received from the manufacturer in order to determine if your prescription has been faithfully filled. Neglect of this precaution may nullify the results of your patient and skilful work in measuring the error of refraction. Therefore it becomes absolutely necessary for you to know how to test and neutralize lenses correctly and expeditiously, as well as to correct any mal-adjustment of the frame or mounting that becomes apparent when placed on the patient's face. INSPECTION OF SPECTACLES In the case of frames examine the lenses to see if they are in properly. You know that a lens can move in the eye wire so that one end or the other will tilt up or down, which in the case of cylinders becomes a serious matter. Take your screwdriver and loosen the screw, turn the lens to its proper position, and then tighten the joint. Turn the glasses sidewise to see if they are both on the same plane: if not, there is probably a twist in the bridge, which can be rectified by the use of two pliers, one for holding and the other for turning. If there is a concave surface on the lens (as in periscopic convex) see that it is next to the eye. If both surfaces are concave, see that the strongest concave is next to the eye. Place the glasses on patient's face to see if the angle of the lenses is right; nearly vertical for distance, or tilted for reading. See that the temples work smoothly in the joints: sometimes the loosening of the screw or the application of a drop of oil becomes necessary. Note the angle of the crest of the bridge and see that it corresponds to the slope of the nose. See that the widt...

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