• The test consists of a series of images, showing many circles of different sizes and colours.

• Each image could have painted circles forming a shape of a one to two-digit number.

• If you are unsure about the number, type in your best guess. You can also skip the answer, if you don't see any number.

• This test is an approximation of colour blindness.

• It's not a definitive answer, because it depends on your computer screen being able to display accurate colours.  However, you can use this test it to get a good approximation.

• Once you receive your glasses look at the picture of the flowers on this page with your glasses on and then without them.  If you can see the "hot pink" flowers then the glasses are working.

When unsure what lens to choose, Pilestone highly recommend our most popular and effective Type: B lens. This lens is universal and is equipped with the technology for all types of color deficiencies and is therefor our most popular and effective lens.