The book has a high graphics content, usually with a text on one page and explanatory diagrams on the opposite page. Below are two samples from Chapter 6, "Glare".

Disability glare (also known as veiling luminance) occurs because our eyes are not perfect and light travelling through the ocular media (the liquid which fills your eyeball) becomes scattered. In other words not all of the light heading for part of your retina gets there.

This scattering of light results in a reduction of contrast. It is as if a veil of luminance has been added around objects in the image on your retina. Hence the term “veiling luminance.”

Any object in your field of view which is not totally black contributes a veiling luminance, but the most important sources are luminaires which have high glare values. It is as if your eye is filled with a slight fog which disperses (for example) the full beam car headlights all over your field of vision.

Samples from chapter 5. Samples from chapter 7.