You can only increase your eyesight by using technology: simply, spectacle, microscope, telescope. However, I think you probably meant to ask about improving your eyesight. This is a matter of avoiding hazards and abuse, such as too many hours at the computer or mobile phone screen, or hours in an atmosphere filled with toxic air pollution.
Being considerably overweight can lead to diabetes and this harms vision. You can carry out eye exercises, abd check you are taking enough Vitamins A, C, and E, as well as zinc. These contain antioxidants that can help prevent macular degeneration.
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