Fig. 1

Schematic of emmetropia and axial myopia. A In an emmetropic eye, parallel rays of a distant object are focused on the retina. B When an eye is tasked to focus on a near object, without accomodation, the image of the object is focused behind the retina. C Accommodation can bring forward the image to focus on the retina. D In axial myopia, the eye's axial length has grown longer than the dioptric focus of the eye. Light rays are therefore focused in front of the retina resulting in the blurred vision of a distant object. E Myopia can be optically corrected using a concave lens (spectacles or contact lenses) which diverges the light rays and moves the image into focus on the retina