Phase 1 · Understand the Body — Why the disease behaves the way it does.
The One-Line Truth
The whole disease in one chain
Everything on this page exists to explain this line.
Close things look clear but far things look blurry because the eye focuses light in front of the retina instead of right on it.
The Camera with a Too-Long Body
Imagine a camera where the lens (cornea and eye lens) is perfectly normal, but the camera body from lens to film is stretched too long. The lens still bends light rays together at the same angle, but now those rays meet at a point inside the camera body—before they reach the film (retina). By the time the light spreads out again and hits the film, the image is already blurry. A normal camera has the right distance from lens to film so rays converge exactly on the film; a myopic eye is like a camera where someone pulled the back wall too far away. The film (retina) never receives a sharp image because the convergence point is always upstream of it. Wearing glasses is like putting a weak diverging lens on the front of the camera to spread the rays out slightly so they converge farther back—right at the film.
American Academy of Ophthalmology (AAO) Preferred Practice Pattern for Refractive Errors · American Optometric Association (AOA) Evidence-Based Clinical Practice Guideline on Myopia · Cochrane Eyes and Vision systematic reviews on myopia progression · World Health Organization (WHO) World Report on Vision 2019 · reviewed 2026-07-09