When it comes to problems with vision, an understanding of where true sight comes from can make a healing difference.
The opening chapter of the Bible is central to this understanding. I've found these verses helpful: "And God said, Let there be light: and there was light. And God saw the light, that it was good: and God divided the light from the darkness. And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day." Gen. 1 :3-5.
What was the light that God saw on the first day of creation? Commenting on these verses in Science and Health with Key to the Scriptures, Mary Baker Eddy writes, "This light is not from the sun nor from volcanic flames, but it is the revelation of Truth and of spiritual ideas." Science and Health, p.504. No solar light is necessary to see the spiritual ideas of God, for the ideas reflect the light of Truth. True sight, then, can be thought of as the conscious knowledge of Truth and its infinite ideas.