Cattle track appearance is seen in

Central retinal aery occlusion (CRAO): It occurs due to obstruction at the level of lamina cribrosa.Symptoms: Patient complains of sudden painless loss of vision.Signs: Direct pupillary light reflex is absent. On ophthalmoscopic examination, retinal aeries are markedly narrowed but retinal veins look almost normal. Retina becomes milky white due to edema. The central pa of the macular area shows cherry-red spot due to vascular choroid shining through the thin retina of this region. In eyes with a cilioretinal aery, pa of the macular will remain normal. Blood column within the retinal veins is segmented (cattle trucking).After a few weeks, the edema subsides, and atrophic changes occur which include grossly attenuated thread-like aeries and consecutive optic atrophy.Ref: Khurana; 4th edition; Pg.No. 255