Glasses (and contacts) change the point where light focuses inside your eye. They are designed to move focus to account for a change of your eye shape (and other causes of incorrect refraction). Glasses are listed in optical power of 'diopters', which is a measurement of inverse meters. By determining how far you can see an image before it looks blurred, we can tell the degree of your refractive error - or 'diopters' necessary to correct your vision. Your vision may change throughout the day - try the test at different times to find out just how much!

Remove your glasses. Look at the word 'focus', moving back from the screen until the word begins to blur. Record the distance between the screen and your eyes.

BLUR LINE

It looks like you need

glasses to see clearly.

Personal Best:    centimeters

Lowest:          centimeters

Average:          centimeters

It looks like you need

glasses to see clearly.

Your vision varies throughout the day, depending on eye strain, lighting conditions, and other factors. A single measurement done at the optometrist, in a dark room, selecting for the sharpest possible image, is possibly more than you need to see properly. There are rumors circulating of overprescription possibly leading to, additional strain, and increasing prescriptions. With proper care you can reduce eye strain and improce your vision. Take measurements befor and after computer time, see how much your vision varies!