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LEARN MORE ABOUT YOUR EYES

Emmetropia
Myopia
Hyperopia
Astigmatism
Presbyopia


EMMETROPIA

("normal" or "perfect" vision) is the condition in which the image of a faraway object is focused exactly on the retina, resulting in clear distant vision.

MYOPIA

Myopia (nearsight) is the condition in which the image of a faraway object is focused in front the retina because the eyeball is too long or the refractive power of the eye is too strong. This results in the far vision being blurry. When a near object is viewed, it is focused on the retina, resulting in the near sight being clear.

HYPEROPIA

Hyperopia (farsight) is the condition in which the image of a faraway object is focused behind the retina, either because the eyeball is too short, or because the refractive power of the eye is too weak. When a near object is viewed, the image becomes focused even further behind the retina, resulting in the far sight being clearer than the near sight. This may cause headaches, eyestrain, and/or fatigue.

ASTIGMATISM

Astigmatism is the condition in which the images of both faraway AND near objects become split into two, making the vision blurry at ALL distances. Astigmatism may cause eye strain and may occur with nearsightedness or farsightedness. Symptoms include headache, eye strain, fatigue, and fluctuating vision.

Presbyopia - OVER 40?

Congratulations! (We can hear you grumbling: “Thanks a lot”.)

You may have noticed that your near vision is starting to become blurry or that it is more difficult to focus on small print than it used to be. This is NOT because your focusing muscles are getting weaker. It is a result of the crystalline lens inside the eye becoming less elastic from normal aging processes. Ultraviolet rays, poor dietary habits, and smoking can contribute to the aging processes, and ultimately lead to cataract formation sooner than normal.

This decrease in the crystalline lens’ elasticity is a universal human occurrence. Eventually every person will need to wear some sort of reading prescription to do the work that the eye can no longer perform on its own (unless they are just nearsighted enough that they can see up close without a prescription).

Currently we have many different options to correct this problem:

  1. Single vision reading glasses.
  2. Lined bifocal glasses.
  3. Progressive (no-line) bifocals.
  4. Lined trifocal glasses.
  5. Bifocal contact lenses.
  6. Monovision contact lenses (one eye for far, the other for near).
  7. Distance contact lenses with reading glasses.
  8. Specialty bifocal glasses, e.g. double bifocal (one segment below, the other above the pupil)
  9. Computer trifocals (specially designed large middle area for intermediate, arms length vision).
Dr. Jeruss TV interview on eye retainers

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Learn More About Your Eyes
Emmetropia
Myopia
Hyperopia
Astigmatism
Presbyopia
More Resources
Medline Plus (Eyes and Vision)
All About Vision
WAVE Contact Lenses
Myopia Prevention and Control
The Ortho-K Network