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The Fast Eyeglasses blog

Eyeglass guides & answers

Plain-English guides to prescriptions, PD, frame sizes, lens types and buying glasses online.

Prescriptions · 3 min read

OD, OS, SPH, CYL, Axis. Here's what every box on your prescription means, and which numbers you need to order glasses online.

How-to · 2 min read

All you need is a mirror, a millimeter ruler and two minutes. Here's how to get an accurate PD for ordering glasses online.

Fit & sizing · 2 min read

Look inside the arm of your glasses. Those three numbers are the easiest way to find a new pair that fits.

Lenses · 2 min read

One power, two powers or a smooth blend. Here's how the three main lens types work and how to tell which one your prescription calls for.

Prescriptions · 2 min read

Most eyeglass prescriptions are valid for one to two years. Here's how to check yours, why it expires, and your right to get a copy.

Prescriptions · 2 min read

They look similar, but contact lens and eyeglass prescriptions aren't interchangeable. Here's why.

How-to · 2 min read

What you need, how to choose a frame that fits, and how to get your prescription right, in six steps.

Prescriptions · 2 min read

If your prescription has numbers in the CYL and Axis boxes, you have astigmatism. It's very common, and single vision glasses correct it.

Kids · 2 min read

Kids need glasses that fit well, survive the playground and look good enough to actually wear. Here's how to choose.

Safety · 2 min read

Side shields, wrap frames and safety ratings. What to check before you order prescription safety glasses for work.

Buying guide · 2 min read

Affordable glasses shouldn't mean surprises at checkout. Here's what a good low price should include, and the red flags to watch for.