Dr. Kavya Nagaraj, N18404, Dr. Padmavathy Maharajan
PURPOSE : To evaluate the etiology, clinical profile of retrochiasmal lesions, and analyse their visual field defects with the neuroimaging yield.
METHODS : A Retrospective analysis of 107 patients diagnosed with retrochiasmal disorders, manifesting with visual field defects were studied. A detailed clinical profile, visual acuity, central fields, and Automated perimetry using HFA were studied. The neuroimaging localisation patterns were also reviewed.
RESULTS : A male preponderance (72%) was seen, with the mean age of presentation being 53.19 years. The most common site of lesion was the occipital lobe (81%), affected secondary to non hemorrhagic stroke. The mean log MAR was 0.39. Homonymous hemianopia was the most commonly observed field defect, as observed by Tangential perimetry (54.2%), and HFA (41.1%) respectively. 47.5 % of homonymous hemianopia was caused by lesions in the occipital lobe, followed by lesions in the temporo-occipital cortex contributing to 10%. 15% of the occipital lesions had severely depressed fields.
CONC