Your grandfather can use it. Shapu Aisi specializes in treating early cataract, especially for the elderly. It is also a well-known national trademark, which is very reliable. Also, the enterprises that produce this kind of eye drops attach great importance to high technology, and the research and development of eye drops is very professional. For example, this Shapu Aisi eye drop was developed by them and won the honor of the National Torch Program, and recommended to your grandfather.