How can one improve the strength of your eyes thus improving the quality of your vision naturally?

Not really effective: This has been a hope for the last 100 years that somehow exercising the muscles that move the eyes, can somehow affect focusing. There is no evidence for this but you can spend a lot of money on such programs for no effect. You will see better with eyeglasses or contacts and discuss with your ophthalmologist whether lasik or prk would be helpful.