Lenses siguro

• Myopia- a person sees near objects clearly while distant objects appeared blurred.

  A near sighted person cannot focus clearly on an object farther away than the far point for the defective eye.
• excessive curve of the cornea or elongation of the eyeball.
• Myopia can be correct using concave (diverging)lens.

  able to bring the image of the object back on the retina itself.
• Hyperopia- farsightedness, the light rays are focused behind the retina.
• Hyperopia can be corrected using convex (converging) lens.

  supply additional focusing power required for forming the image on the retina.
• Presbyopia is caused by aging
• Presbyopia can be corrected using bifocal lenses.
• presbyopia is when the ciliary muscles lose their ability to change shape as we age.