There are many reasons of weakness of eye in small age. Some of the reasons are:
1. Genetic problem. If any one parent has weak eye then there is a possibility of weakness of eyes in children.
2. Different part develop in the different month in an embryo. And the maturation of eye completes in the last month i.e. in the 9th month of the pregnancy. If delivery takes place in the month of 7 or 8 then there is also a possibility of weakness of eye in the children.
3. Sometimes diet may also affect the eyes.
4. Lack of nutritious food at the time of pregnancy.
So, these are some reason of weakness of eye in a small children.
There is no need to be panic. It is common in the modern time. I will suggest to do the following:
1. Visit the ophthalmologist at a regular basis.
2. Try to provide vitamin A rich diet like radish, carrot, milk, egg, green leafy vegetables, etc.
3. You can also give vitamin A tablets which are available at every medical store.
4. If doctor has prescribed any medicine, please give it at regular time and visit the doctor as scheduled.
5. Encourage you children to do every routine work and never try to discourage her in any manner.
6. Also use simple glass instead to use photochromic glasses.
I hope your daughter would be able to improve her eye sight as soon as possible.
Honesty is the best policy.