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XVI. Terms and facts:

 1. The cornea is the most powerful refracting surface of the eye.

 2. Refractive index of the cornea is = 1.376.

 3. Index of refraction of the aqueous is = 1.336.

 4. Emmetropia is normal vision.

 5. Myopia: Nearsighted, image focus falls in front of the retina, a concave lens (-) is used to correct
     this condition.                  

 6. Hyperopia: Farsighted, image focus falls behind the retina, a convex lens (+) is used to correct this
     condition.                                                                                       

 7. Presbyopia: Loss of accommodation due to age.

 8. Exophthalmos: Protruding eyes.

 9. Enophthalmos: Recessed eyes.

10. Diffusion: Process by which distribution of molecules happens.

11. The retina is an extension of the central nervous system.

12. Dialysis: Water is transferred into a solution of protein.

13. Ultrafiltration: Salt is transferred into a solution of protein.  Dialysis in the presence of 
       hydrostatic pressure.  

14. Index of refraction of the lens is = 1.390.