Yes, cataract surgery is covered by Medishield and other insurance policies in Singapore. In fact, many of my patients have managed to claim the entire cost of their bill from Medishield and other personal or company insurance policies.
Clinics that are Medisave accredited will be able to check your mother’s extent of coverage very easily using her full name and NRIC number through a nation-wide electronic registry which holds all the information about every citizens insurance coverage. Simply ask your eye clinic to assist you to check your exact coverage.