PREVIOUS QUESTION:

 

NEXT QUESTION:

 

What parts of the eye help you focus?

ANSWER

Nearly two-thirds of the eye's focusing power occurs along its front surface (tear film or cornea). The normal cornea should be shaped like a baseball so they eye can create a single focused image. If the central cornea isn't symmetrical or uniform, you have astigmatism.

Nearsightedness and farsightedness have to do with how clear images are at the back of the eyeball. The further away images focus from the layers of delicate nerve tissue that make up the retina, the blurrier they appear.

SOURCES: 

Bradford, C. (Editor) Basic Ophthalmology, American Academy of Ophthalmology, 2004. 

The Mayo Clinic: "Eye Care."

Macular Degeneration Partnership.

Reviewed by Whitney Seltman on February 7, 2020

SOURCES: 

Bradford, C. (Editor) Basic Ophthalmology, American Academy of Ophthalmology, 2004. 

The Mayo Clinic: "Eye Care."

Macular Degeneration Partnership.

Reviewed by Whitney Seltman on February 7, 2020

NEXT QUESTION:

What is retinal detachment?

WAS THIS ANSWER HELPFUL

"ALEXA, ASK WEBMD"

THIS TOOL DOES NOT PROVIDE MEDICAL ADVICE. It is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Never ignore professional medical advice in seeking treatment because of something you have read on the WebMD Site. If you think you may have a medical emergency, immediately call your doctor or dial 911.

    This tool does not provide medical advice. See additional information.

    Other Answers On: