Can try going to UKM medical centre (formerly known as HUKM) in Cheras. They've got a good Ophthalmology team. They have a private wing, which u need to pay at a higher rate. But u can get an appointment almost immediately.

Otherwise, get a referral letter from a doctor (can be from the normal GP clinics) to see the Ophthalmology Clinic. However, the waiting list is slightly longer, but u still get the same treatment from the same doctors. Just the the charges lower.