Brief Answer:
C eye drops is known to decrease progression of age related cataract.

Detailed Answer:
Hello
Welcome to Health care magic

I reviewed your history.
C eye drops is an antioxidant eye drop and it is known to be protective against progression of age related cataract. It is effective in early cataract.
But it will not act once the cataract has already advanced.
Hence because of its limited efficacy surgery is the treatment for cataract.

Hence C eye drops is used only in early cataract and in people who want to avoid cataract surgery.

Hope I have answered your question and the information is helpful to you.
Do write back to me for further questions.

Thank you
With regards

---