Vision Report Rubric
The Vocabulary of Sensory Impairments
To be able to understand fellow students or friends with sensory impairments, you need to understand the terminology used to describe these disabilities. The following terms are some you will encounter in your dealings with people who have sensory impairments and the specialists who work with them.
Types of vision problems:
Seeing More Than The Sum Of The Parts
The eye and brain break up the visual world into various aspects, such as color, form, motion, and depth. These pieces of the picture are interpreted in a complex network of processing centers. To form a coherent picture of the world, the eye-brain takes signals from the retinas, relays them through the lateral geniculate bodies, and then passes them on to areas Vl and V2 (revealed in the inset, which shows the brain from beneath). These areas engage in a dialogue with centers farther along the pathway-some of which are still unidentified. Sensory Filtering: The Visible Spectrum As you'll learn when we discuss light, our eyes have evolved to process electromagnetic radiation. However, the range of electromagnetic radiation that falls within the visible spectrum is only a small part of all electromagnetic radiation. So we can see wavelengths between about 400 and 700 nanometers (all the colours of a rainbow), but we can't see Infrared or Ultraviolet. Not all creatures evolved with the same visual systems though. Depending on what cues would be most useful for a particular animal, it may evolve different capabilities. For example, although we cannot see Infrared light, some animals can. This picture shows a face photographed with film that is sensitive to infrared light. Looking at the picture, you can imagine how different your world would look if our visual system processed different sorts of information.
Sensory Filtering: The Visible Spectrum
Our eyes have evolved to process a small portion of electromagnetic radiation, which runs from sound waves to UV, and up to Gamma Rays. Our eyes only detect a sliver of the entire range of electromagnetic radiation. We call that sliver the visible spectrum. So we can see wavelengths between about 400 and 700 nanometers (all the colours of a rainbow), but we can't see Infrared or Ultraviolet.