Unit-Testing Your Vision
There is no substitute for a professional eye exam by an optometrist or ophthalmologist, and getting one is your goal for this chapter. In fact, you should get one every year or two because many eye diseases are asymptomatic, which means they could become dangerous before you realize they exist. But even in the absence of a professional examiner, you can still run some basic eye tests using an application on your phone or computer.
Most apps will test visual acuity (via reading an eye chart from a distance), retinal function (via detection of visual disturbances caused by changes in the retina) and color-blindness. Go find one right now and try it out—some good apps are listed at http://healthyprog.com. Using them ...
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