Stress and misuse affect not only the mental processing but the focus of the eyes. Eye length changes only a very tiny amount and is due to various tense muscles around the eyes and/or some other mechanism. In any case, the eyes’ focus improves immediately when the eyes start to relax and are used better, and in the long-term as the practice is continued.

Our bodies change constantly in response to the environment and our intent. Cells are replaced, bones repair, and nerves regenerate. Bones become more dense and muscles grow in response to exercise. Somehow our limbs and organs work fluidly, keep us alive, and problems with movement and function are overcome on a daily basis. The more the body is used properly, with good form, and challenged, the stronger and more healthy it becomes. If there is any issue with a tiny error in the shape of the eyes, overcoming it is nothing compared to the other amazing adaptations the body can do, and the error would only exist in response to misuse or a serious calibration error that would render any other body part useless.