. A treatise on the diseases of the eye. eadily to-gether. When the fundus is well illuminated, we should first endeavor to gain aview of the optic disk, and the patient should therefore be directed to lookat the ear of the observer which is on the opposite side to the eye under ex-amination, so that the optic axis of the latter may be turned somewhatinwards. Thus, if the right eye is to be examined, the patient should looktowards the surgeons right ear, and vice versa; for as the entrance of theoptic nerve is not situated in the optic axis (centre of the retina), but towardsits nasal side, it
. A treatise on the diseases of the eye. eadily to-gether. When the fundus is well illuminated, we should first endeavor to gain aview of the optic disk, and the patient should therefore be directed to lookat the ear of the observer which is on the opposite side to the eye under ex-amination, so that the optic axis of the latter may be turned somewhatinwards. Thus, if the right eye is to be examined, the patient should looktowards the surgeons right ear, and vice versa; for as the entrance of theoptic nerve is not situated in the optic axis (centre of the retina), but towardsits nasal side, it is necessary that the patient should look inwards, in orderthat the disk may be brought directly opposite to the observers eye. Togain this position, the patient may also be directed to look at the upliftedlittle finger of the hand holding the ophthalmoscope. In this case its handlemay be held horizontally, and the left hand used for holding the mirrorwhen the left eye is under examination. It is still more convenient to have Fi?. a screen or board, divided into differently numbered compartments, placedat some distance behind the surgeon. The patient is then directed to lookat a certain figure upon the board, according to the part of the fundus whichwe desire to examine. The object should always be placed at some distance,in order that the patients accommodation may be relaxed to the entrance of the optic nerve is readily recognized by its presenting awhitish reflex, instead of the red glare reflected from the fundus. As soonas this white reflex is obtained, the object-lens should be adjusted, and weshall then have no difficulty in finding the optic nerve entrance, which ap-pears in the form of a circular pinkish-white disk, on whose expanse arenoticed numerous bloodvessels, which diverge from it to be distributed todifferent portions of the retina. If the disk is not in view, it may also beeasily found by tracing some of the retinal vessels up to the point to
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Keywords: ., bookcentury1800, booksubjecteye, booksubjecteyediseases, bookyear
