The word meal means any time when you eat a large amount of food. There are typically 3 meals per day - breakfast (in the morning), lunch (mid-day), and dinner (at night). A snack is a smaller amount of food (for example, a bag of chips or a piece of fruit) and you can eat a snack anytime.
In American English, dinner and supper are the same - both are used to describe the evening meal. However, in some cultures, the word supper is used for a light meal served in early evening, and dinner may be later in the night.
If you want healthy eyes and improved vision, you should surely eat peaches. Peaches are rich in beta carotene, a compound that is required to produce vitamin A in the body. Vitamin A is important for maintaining a healthy retina. Beta carotene also prevents eye disorders like night blindness and agerelated macular degeneration.