I assume that, this is a condition of Diabetic Retinopathy(DR). If any other Retinopathy, please don't follow the bellow instruction and get back to me with the details.
I would like to know, the stage of his DR. Follow-up and the type of treatment would depend upon the stage. Early stage of DR, does not need immediate treatment, but regular follow-up is must.
Patients having Retinopathy are most of the time, also diagnosed with Nephropathy. It's better to consult a Nephrologist as well, so that he/she can assess the status of the kidney.
I would suggest him to control his blood-sugar level first. To asses his current situation, he should go through the following tests
- FBS (Fasting Blood Sugar)
- PPBS (Post Prandial Blood Sugar)
- HbA1c (Glycated haemoglobin - you can find details here : http://www.diabetes.co.uk/what-is-hba1c.html )
- Microalbumin level in urine
- Fundoscopy (testing the retina of eye)
- Other retinal tests ( e.g. FFA, OCT ) might be required depending upon the severity of the Retinal damage
Regular quarterly eye check-up (Fundoscopy) is a must, so that timely treatment can be done when required, to prevent progression of Diabetic Retinopathy(DR).
Consult with Diabetologiest / Physician for treating the diabetis.