Hart charts help to train our eyes in accommodation, which is changing our focusing from distance to near. Specifically, Hart Charts help to improve accommodative facility - the ability to increase and decrease our focusing on demand. A variety of binocular vision problems cause a decrease in our ability to accurately focus: some people focus too much and cannot relax; other focus too little and experience blurry vision for close tasks.
Complete five rounds of these cycles, three times per day. When you are proficient at having the near chart at 40cm, your optometrist will recommend you move the chart closer, first to 30cm then finally to 20cm. Remember: For these exercises to be effective, the letters/numbers you are looking at need to be clear and single. Ask us if you have any questions about the exercises.