I googled eyes problems in Pembroke Corgi's they came up with 2.

1)  Progressive Retinal Atrophy ( PRA)  Also known as Progressive Retinal Degeneration ( PRD). Look for change in dogs personality i.e. wont walk down a dark hallway or go downstairs suggesting night blindness. Vision improves during daylight hours!. Pupils dilate as the disease progresses!.

2) Shine condition.  Corgi's develop a cloudy look in their eyes known as shine!. I need to schedule a Ophthalmoscopic Examination to confirm a diagnosis!. I will ring my old vet and schedule an appointment for Oscar ASAP.

Isn't google great you can google anything and get info instantly!.

Regards

Oscar's Dad

Brian