From my experience with cannabis it is good for the eyes. I've had glaucoma 27 years and did not use doctor prescribed the first 6 years. Pot dried up around here and my opthamologist put me on betopic then timoptic then pilopine gel then xalatan. These medicines worked best when I also used cannabis. Using the medicines alone only led to laser surgery.
I also have had diabetes 41 years with no sign of diabetic retinopathy. After
many more years than any doctor spent becoming a doctor I know from experience cannabis is excellent medicine for the eyes. I had to tell my doctor why I wasn't going blind. He admitted cannabis was working for me.