Page 1 - mind map - defects of vision
P. 1

Occurs due to
                                                                                 Excessive curvature of the
                                                                                        eye lens
                                                                                   Elongation of eyeball
                                                Myopia or Near-sightedness


                                                                                     Concave lenses


                     Defects of vision
                                                                                Focal length of the eye lens is
                                                                                        too long
                                                                                  Eyeball has become too
                                                                                        small.
                                                    Hypermetropia or
                                                     Farsightedness

                                                                                    Convex lenses
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