1. We use the eye of time should not be too long
2. Reading, the eyes and a tree to keep a distance of about one foot is appropriate
3. We can not dim or the sun, under a strong light reading
1. We use the eye of time should not be too long
2. Reading, the eyes and a tree to keep a distance of about one foot is appropriate
3. We can not dim or the sun, under a strong light reading