. Refraction and how to refract : including sections on optics, retinoscopy, the fitting of spectacles and eye-glasses, thatportion of the retina above the fovea. {/>) The image of an object formed upon the retina belowthe fovea is projected upward—i. c, objects situated abovethe horizontal line of vision are recognized b) that portionof the retina below the fovea. (r) The image of an object formed on the retina to thenasal side of the fovea is projected toward the temporalside—/. c\, objects to the temporal side have their imagesformed upon the nasal portion of the retina. 172 MUSCLE
. Refraction and how to refract : including sections on optics, retinoscopy, the fitting of spectacles and eye-glasses, thatportion of the retina above the fovea. {/>) The image of an object formed upon the retina belowthe fovea is projected upward—i. c, objects situated abovethe horizontal line of vision are recognized b) that portionof the retina below the fovea. (r) The image of an object formed on the retina to thenasal side of the fovea is projected toward the temporalside—/. c\, objects to the temporal side have their imagesformed upon the nasal portion of the retina. 172 MUSCLES. 173 {(I) The imaijc of an object fornietl on the retina to thetemporal side of the fovea is projected toward the nasal side—/. c, objects to the nasal side have their imat^es formedupon the temporal portion of the retina. Homonymous Diplopia (Greek, utiwwiw:; from i,i,.u^,same, and Zvofia, name).—Mt^ure 152 shows the right. Fk;. 152. eye (R) fixing upon the object (O), but the left eye isturned inward, so that rays from O fall upon its retina to thenasal side of the fovea (M), and are projected outward tothe temporal side ; the result is that the left eye sees a to the left of the real object. This condition of theobjects is spoken of as homonymous diplopia. 174 REFRACTION AND HOW TO REFRACT. Heteronymous Diplopia (Greek, ?r£/«;r, other ; and ovufxa,name).—Figure 153 shows the right eye fixing the object(O), but the left eye is turned outward, so that rays from Ofall upon the retina to the temporal side of the fovea and areprojected to the nasal side, with the result that the left eye sees a false object/ to the right of the real object. This condi-tion of the objects isspoken of as heter-onymous or crosseddiplopia. Hyperphoria(Greek, u-ep, over,above; ilopa, mo-tion).—In the con-sideration of verticaldiplopia, — which isalways a conditionof crossed diplopia,never homonymousdiplopia,
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