I thought it was DUSN, since the nerve was pale, and it was unilateral. It also did not look like the PPRA on last year's test. The classic Description of PPRA is bilateral.
Here's an excerpt from a case report in Nature:
Pigmented paravenous retinochoroidal atrophy (PPRA) is an uncommon disease characterised by paravenous zones of retinal degeneration with bone spicule pigmentation.1,2,3,4,5,6,7,8,9 This is an asymptomatic disease usually detected during routine ophthalmic examination. The condition is generally bilateral and young adults are most commonly affected. The cause of the disease is unknown although an inflammatory10 or hereditary11 aetiology has been suggested. We report a case with typical fundus appearance of paravenous pigmented retinochoroidal atrophy accompanied by an active inflammation with cystoid macular edema.