This is the capacity responsible for the number of symbols or objects a person can see in one visual fixation. When the span is restricted to below four symbols the following problems occur.
The person cannot see whole words in a single visual fixation. He must make three to ten times the normal number of fixations to read a line of printed material. This causes severe eye fatigue when reading and in severe cases can result in temporary blindness from overworking the eyes. People with this problem report that they cannot read for more than 30 to 60 minutes without taking a break to rest their eyes. The eyes become bloodshot as they eye muscles are overworked from making visual fixations.
Reading is experienced as jerky and errors occur when the eyes become fatigues and miss fixations. These types of errors also occur in clerical work.
Reading speed is slowed down due to the extra time required to make the increased number of visual fixations.
Navigating in the dark is difficult, e.g., finding a seat in a darkened movie theater or driving in the dark.
'Arrowsmith's Description of Learning Dysfunctions'
Reprinted with permission from: www.arrowsmithschool.org
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