What are the foods that help improve vision in kids and how many servings in a day should you give?

My son has been wearing specs since the age of 7. My son has always been a good eater with limited gadget time. My son's eye specialist said that his vision was myopic because of genetic reasons. He said he could have all the healthy diet but the change in vision couldn't be altered. You can keep giving your child all food groups. Include a lot of leafy vegetables, eggs, chicken, fruits, nuts, milk and milk products to keep his body and vision healthy.