

Right, but we’re talking about the eye, which glasses are made to focus light into a pin-point with in combination with the natural refractive properties of the eye itself when placed at a specified distance from the eye. Naturally if the glasses were specifically created with a more appropriate focal length, it would be much easier to start a fire with them.


The retina is not as small as a pinhead, but the light from any source doesn’t get focused over the whole thing, it gets focused to a point. Anything else would mean the image is blurred, defeating the point of the glasses.