Research presented on Sunday at the 116th annual meeting of the American Academy of Ophthalmology shows that backlit tablets, such as the iPad and Kindle e-reader, help patients who suffer from vision problems due to eye diseases regain the ability to read at a comfortable level. The discovery could aid millions of people who have lowered vision because of conditions such as macular degeneration or diabetic retinopathy. In the study, the iPad was found to score the biggest improvement in helping readers regain a high and comfortable reading level.