Focus and refraction
Why can the same eye see a book and a distant building differently?
The cornea and lens bend light towards the retina. See what happens when the focus and the back of the eye do not line up.
Vision labs
Seven short experiments. Change one thing at a time and watch what happens to an everyday task.
Detail and contrast
Can something be sharp and still hard to make out?
Small detail and low contrast are different demands on vision. Change one at a time to see why a letter chart cannot describe every part of useful sight.
Central and side vision
What do you miss when a different part of the view is hidden?
Central vision handles fine detail. Side vision is the surrounding view. Compare the same scene with a central patch and with the outer field restricted.
Light and glare
Why can a bright lamp make a task harder?
A direct reflection can wash out detail. Explore the difference between how much light there is and where the light falls.
Colour and information
Can you follow a route when colour is no longer the only clue?
Colour vision differences usually affect particular colour pairs. Labels, symbols and patterns make information readable without relying on colour.
Two eyes and depth
Why do nearby objects shift more between two viewpoints?
Each eye has a slightly different view. The brain uses the difference, along with other clues, to judge depth.
Rods and cones
Why does the order of rods and cones matter?
Explore the different contributions of light-sensitive cells and the terminology of inherited retinal conditions.