Yes: cataract surgery is safe for renal patients.
Patients with the additional concern of diabetic macular edema (this is the most common and most important cause of visual decline in diabetic patients) needs more care in minimising the risk of worsening edema due to post surgery inflammation.
I routinely perform cataract surgery under topical anaesthesia (no injection around the eye) of eye drops alone, so this is an even safer option for renal patients. I would however suggest that your dad schedule his dialysis session the day before surgery though.
If he would like, we can have a more detailed discussion about his specific risks and tailor the discussion to optimise his surgical outcomes after a comprehensive ophthalmic examination.
