The Problem-Solving Approach to Patient Care; Headache; Light Sensitivity; Light Flashes and Floaters; Hyperopia; Myopia; Anisometropia and Aniseikonia; Presbyopia; Low-Power Lenses; The Dissatisfied Refractive Patient; The Eye Not Correctable to 20/20; Induced Refractive and Visual Changes; Refractive Amblyopia; Ocular Hysteria and Malingering; Accommodative Dysfunction; Horizontal Deviations; Monocular Diplopia; Age-Related Cataract; Aphakia and Pseudophakia; Color Deficiency; Reassurance Therapy