Lens thickness calculator for glasses

So here you are. Probably at your wits end, trying to pick some glasses, and trying to figure out how the lenses will turn out. Well we don't have all the answers, but we will give it a shot.

Get your Pupillary Distance (PD)

First up, if you've not read our article on lens thickness, then that's where you need to start. It's where we talk about all the variables that can effect thickness - one of those being your PD (Pupillary Distance). Even if you're not buying your glasses from where you're getting your eyes tested, you can ask them to include your PD on your prescription. There are also lots of digital tools and apps out there that can scan and measure it. Ideally, you need your duel pupillary distance measurements (also called monocular centration distance) - basically a right and left measurement.

Ask about thickness

Next, if you're buying your frames in-store, ask the staff to support you on predicting lens thickness. If they say it's not possible, push them or ask them to find out more information. If you're being helped by a sales staff member, then ask them to bring out a big dog who's more trained, liked the optician. Some stores might even have the staff that make and fit the lenses who you can talk to.

Use a calculator or app

It is possible to work out an estimate of how thick your lenses will end up being in each pair of frames you're thinking of getting and for each eye. You can use an online calculator like this one. There is also an app available by GlassifyMe with a lens visualiser which is in life-size scale.

You'll need your prescription including your PD, and the measurements of the glasses.

- The first 3 items to fill in reflect your RX optical prescription.

- Your PD is the distance between the centre of each of your pupils. The average PD for men is 64, and for women it's 61.

- Lens material is the thinning option you've been recommended, or that you usually get. The thinnest option would be 1.74 for plastic lenses. 

- The frame eye size and bridge you should be able to find on the glasses description and is usually in this format: 46-22-145. These are usually found written on the inside of every pair of glasses. 

This isn't a totally full proof way of determining exactly how they will end up in a specific style of frame, because of the lens shape and how it will be cut out to fit your glasses. 

We're really hoping to add our own calculator in the future, and simulate some example lenses in our frames to take away the guess work. Take a look at our range of glasses designed specifically for thick lenses here.