By Erna E. Kritzinger
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Extra resources for A Colour Atlas of Optic Disc Abnormalities
Remember Perversion Quotient The highest visual acuity in an eccentric fixation patient is the eccentric point and not the fovea. This is angle o f anomaly/angle o f squint. Investigations Explanation Comeal Reflection Test Let us take a patient in whom the LE is normal and the right eye is esotropic. Now, at this stage the left eye looks at a point О with the fovea F. This is normal for that eye. As the right eye is esotropic, the fovea F of the RE looks at another point X as it cannot look at O.
Quadrant with maximum image separation? The yolk muscles acting in that quadrant? The peripheral image in that quadrant belongs to the eye with the paralyzed muscle. In case of Recti/Obliques- Intuming /Outturning of deviating Image? If Intum: SR/SO, If Outturn: IR/IO. D isadvan tages • Qualitative. • Requires cooperative and intelligent patient. • Cant test in color blind patients. • Not useful in congenital palsies and long standing cases , because in deep suppression diplopia cannot be elicited.
Towards the diseased side. This is because in this position, the right LR is not working at all and only the right MR is working. Test Hirschberg found that each 1 mm of decentration of the com eal reflex corresponded to 7 degrees of deviation of the visual axis. Thus, 1 mm = 7 degrees. e. towards the normal side. This is because in this position the right MR is not working and only the right LR is working. Right SR Palsy In this test, the examiner stands in front of the patient and shines a light in the patient's eyes and observes the position of the reflection of the light on the cornea.