Light Sense

Detection of accommodation with an optometer

Principle

When looking through a slide with two very small holes located very close together (optometer aperture), in the absence of accommodation relative to their distance, objects close to the eye appear to be relatively well focussed except that there appear to ...

Spectral colour splitting and recombination to white light

Subjective colour mixing with the colour wheel

Principle

If a circular disc separated into various differently coloured sectors is rotated by a motor so fast that the eye can no longer distinguish the colours, a mixed colour is then perceived. By varying the composition and size of the sectors, it is possible to give the ...

Determination of the human visual field

Principle

This experiment is to determine the field of vision of the right and left eyes using the colours white, red and green and to determine the location of the blind spot. This involves focussing on a mark which is then moved slowly from the periphery on the inside of th ...

Temporal resolution of the human eye

Electronystagmography

Principle

Electronystagmography (ENG) is an electrophysiological diagnostic procedure for measuring the movement of the eyes. Several electrodes measure the potential differences that are caused by the eye movements. When looking at a moving, regular, repetiti ...

Receptors of equilibrioception (model experiment)

Vision defects (model experiment)

Reaction test

Effect of centrifugal forces on plants

Phototropism

We measure our eye movements - electrooculography

Principle

With this experiment, you can find evidence of the electrical activity that is generated during the movement of your eyes. Several electrodes attached to the skin of the face measure all the changes of the electrical voltage that are caused by the mov ...

We measure our reading speed - measuring reading skills EP6

Principle

With this experiment, you can determine your own personal reading speed. One's reading speed can be trained and is an important prerequisite for the proper handling of all kinds of texts. You can precisely study the movement of your eyes during the m ...

Phototropism and geotropism

Priciple and tasks:

To test the reaction of shoots, leaves and roots of higher plants to light stimuli (photoperiodism) and to stimuli caused by the earth's field of gravity (geotropism). To measure the alignment of shoot, leaf and root of bean seedlings which sprout in a ves ...

The effect of gravity and centrifugal force on plants

Principle and tasks

To measure the alignment of shoots and roots under the effect of centrifugal forces which are less than, equal to or greater than gravity. To raise sunflower seedlings in small beakers in a rotating drum. To set different centrifugal forces by changing the ...