Monkeys in the Mist

A brown exhibit table with a vertical dispaly area that has a monitor screen and the words 'Monkeys in the Mist' on the screen.

Contrast sensitivity is one measurement of human eyesight.

How it works

Touch monkeys on the screen that are hidden within a misty jungle and check your score representing how well you can detect grey shades overlaid onto darker or lighter backgrounds.

Things to try or ask around the exhibit

Try doing the test using one eye, then the other eye and see if there is a difference between your eyes.


Contrast sensitivity measurements are used during eye tests to determine how easily a person can distinguish between shades, such as a grey, undefined shape placed on a white background.

As humans naturally age, their corneas and lenses tend to thicken and become 'cloudy', so light wavelengths tend to be affected as they enter the eyeball.

Finding the science in your world

Contrast sensitivity measurements can be important in detecting early signs of diabetes and cataract development, which both cause a person's vision to deteriorate. A difference of contrast sensitivity between the two eyes may indicate diabetic retinopathy.