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That's good to hear, do let me know if there anything i can do to help or clarify for you and you can keep me updated on how things go too

While waiting for his operation to be scheduled in a public hospital, is there a drop that can use to apply? or remedy

Sugar levels are systemic and thus ought to be seen by a general physician, is it not a situation that drops can remedy. What i can advise is to take in lots of fruits and vegetables during this period, you may give him vitamin C supplements, it is the most powerful antioxidant with regards to the eye.