. Refraction and how to refract : including sections on optics, retinoscopy, the fitting of spectacles and eye-glasses, -es and glassesworn constantly, the squint disappears entirely ; but as soonas the cycloplegia passes away and near vision is attempted,the squint returns, and vision falls back in the squintingeye to almost the same point that it had before the cyclo-plegia. This occurs in cases where the amblyopia is becom-ing established, or where there is a strong muscle devi-ating the eye. If the squint is due to amblyopia exanopsia,then the vision may be improved in one of two waj
. Refraction and how to refract : including sections on optics, retinoscopy, the fitting of spectacles and eye-glasses, -es and glassesworn constantly, the squint disappears entirely ; but as soonas the cycloplegia passes away and near vision is attempted,the squint returns, and vision falls back in the squintingeye to almost the same point that it had before the cyclo-plegia. This occurs in cases where the amblyopia is becom-ing established, or where there is a strong muscle devi-ating the eye. If the squint is due to amblyopia exanopsia,then the vision may be improved in one of two Fu;. 160. One is to use drops in the fixing eye, and thus compel thesquinting eye to do the seeing ; or to cover the fixing eyewith a blank over the glass (see Fig. 160), and have thepatient practise in this way for one or two hours each da)-,using the squinting eye alone. Cases that are cured by correcting the amctrojiia mustwear their constantly. Glasses in such cases be abandonetl. In young children the squint re-turns almost at the instant the glasses are removed. Theearliest age at which can be jirescribed is three )-earsor thereabouts, as it would be unreasonable in i/iost expect a child to appreciate the glasses as anything but atoy before this age. 198 REFRACTION AND HOW TO REFRACT, The younger the patient when glasses are prescribed, themore favorable the prognosis and less likelihood of a ten-otomy. The older the patient wiien glasses are ordered, theless likelihood that glasses will cure the squint and theprobability of a tenotomy being
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