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2. Prism correction - Wikipedia

   en.wikipedia.org/wiki/Prism_correction

   Prentice's rule is a formula to calculate the amount of prism correction in a lens based on decentration and lens power. It can be used for prescribing, tolerance control, or determining unprescribed prism in eyeglasses.

3. Hemispatial neglect - Wikipedia

   en.wikipedia.org/wiki/Hemispatial_neglect

   Hemispatial neglect is a neuropsychological condition in which a person cannot perceive or attend to the side of space opposite to brain damage. It is caused by damage to the right parietal lobe or temporo-parietal junction and affects visual, auditory, proprioceptive and olfactory domains.

4. Eyeglass prescription - Wikipedia

   en.wikipedia.org/wiki/Eyeglass_prescription

   Learn how to interpret and write an eyeglass prescription that includes sphere, cylinder and axis components. Sphere and cylinder specify the power of the lenses, and axis defines the orientation of the cylinder relative to horizontal and vertical.

5. Visual impairment - Wikipedia

   en.wikipedia.org/wiki/Visual_impairment

   Visual impairment is the partial or total inability of visual perception, which may be caused by various conditions or problems in the eye or brain. Learn about the symptoms, complications, treatment, and prevalence of visual impairment, as well as the different categories and definitions used by WHO and other countries.

6. Convergence insufficiency - Wikipedia

   en.wikipedia.org/wiki/Convergence_insufficiency

   Convergence insufficiency is a binocular vision disorder that affects the ability of the eyes to turn towards each other. It can cause symptoms such as double vision, eye strain, headache, and difficulty reading. Learn about the diagnosis, treatment, and prevalence of convergence insufficiency.

7. Functional visual loss - Wikipedia

   en.wikipedia.org/wiki/Functional_visual_loss

   Functional visual loss is a reduction in vision with no physiological or organic cause. It can be caused by psychological factors and has social and economic impacts. Learn about its diagnosis, treatment and differential diagnosis.