No eyedro can help in reducing or stop progressing of eye no.
If it is positive no usually it decreases with growth of eye.
If it is negative no .myopia it increases with age till maturity complete like 18 years in female and 20 years in male.
Fish and fish oil
contain bit A and no harmful .if someone want he can take it. But it may not help to reduce the spect no. However it is good for eye health.
Taking adequate sleep. Blinking knowingly while working on compeuter. Using lubricating eyedrop. Eating fruits rich in Vit A .keeping eye hygiene are needed for healthy eyes.