<prompt> In POAG primary open angle glaucoma which is not seen a Horizontal cuppingb Bayoneting sign crossing of vesselsc Macular oedemad Dot signabcadac  <response>: Glaucomatous changes in optic discEarly glaucomatous changes :- i Vertically oval cup; iiAssymmetry of cup; iii Large cup with cup : disc ratio 0.5 normal 0.3 - 0.4; iv Splinter hemorrhages; v Pollar area on disc; vi Atrophy of retinal nerve fibre layer.Late glaucomatous changes :- i Marked cupping cup : disc ratio 0.7 to 0.9; ii Thinning of neuroretinal rim; iii Nasal shifting of retinal vessels with broken appearance at margin Bayonetting sign; iv Pulsation of the retinal arterioles at disc margin pathognomonic; v Pores in lamina-cribrosa lamellar dot sign; vi Total bean - pot cupping; vii Total disc pallor. 