A specific and realistic aim
A visual task can ask you to find a detail, follow a sequence, or compare two images. Repeating it may make you more familiar with that task. This is a different question from whether an exercise changes eyesight, expands a visual field, or treats a problem with eye coordination. Those claims need evidence for the particular condition and method.
Begin with the reason you are considering training. If reading is uncomfortable or vision has changed, arrange appropriate assessment rather than attributing the problem to weak eye muscles. The National Eye Institute emphasizes eye care, suitable examinations, protection, and healthy habits. A general online drill should not stand in for that assessment or for a prescribed treatment plan.
Make the next step useful
For an ordinary observation exercise, choose a comfortable, well-lit object and describe several visible details in words. You might notice shape, color, spacing, or the relation between parts. Keep the task brief and stop if it causes discomfort. The purpose is to practice description and attention, without testing the limits of your eyes or attempting to force a change in vision.
If a commercial program promises faster reactions or better sports performance, ask which people were studied, what comparison was used, and whether the benefit appeared outside the practiced exercise. Ask about costs, supervision, adverse effects, and the possibility of no useful result. Keep any improvement claim attached to the outcome actually measured; a higher game score does not establish healthier eyes.
Sources & further reading
- National Eye Institute: Keep your eyes healthywww.nei.nih.gov