Subject: Scientific Videos for all Natural Eyes.

Reference:  The is a dynamic system.

Here are two videos to show how this property of all normal eyes are determined.  The effect of a negative lens – on the normal eye.

The effect of a positive lens – on the normal eye.

The natural eye is not a frozen box camera – as it is taught in High School.

Based on this objective science – it is possible to suggest that a motivated pilot could convince himself to begin wearing a strong plus (for all near work), and slowly get back to naked-eye 20/20.  Pilots have done this – so we know it can be accomplished.

Equally, direct science, confirms the dynamic eye animation you see presented here:

Prevention will always depend on the person himself.  It can not be prescribed.