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Human Performance and Limitations

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Submitted By redpillbox
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Human Performance and Limitations
Just like aircraft components have limitations, engineers also do have certain capabilities and limitations.
Vision: Please study the Basic Function of the Eye! (CAP 715)
You should understand Pupil, iris, lens, cornea, retina, cones & rods, optic nerve to the visual cortex in the brain, and Myopia, presbyopia, hypoxia, Color Vision - see CAAIP!
When a person is tired accommodation is reduced, resulting in less sharp vision (sharpness of vision is known as visual acuity). Cones function in good light and are capable of detecting one detail and are color sensitive. This means the human eye can distinguish about 1000 different shades of color. Rods cannot detect color. They are poor at distinguishing one detail, but good at detecting movement in the edge of the visual held (peripheral vision). They are much more sensitive at lower light levels. As light decreases, the sensing task is passed from the cones to the rods. This means in poor light levels we see only in black and white and shades of grey. Visual acuity is the ability of the eye to discriminate sharp detail at varying distances.
Various factors can affect the eye: Physical factors such as: physical imperfections in one or both eyes (short sightedness, long sightedness),age The influence of ingested foreign substances such as: drugs, medication, alcohol, cigarettes. Environmental factors such as: amount of light available, clarity of the air (e.g. dust, mist, rain, etc.). Factors associated with object being viewed such as: size and contours of the object, contrast of the object with its surroundings, relative motion of the object, distance of the object from the viewer, the angle of the object from the viewer. Color-defective vision (normally referred to incorrectly as color blindness) affects about 8% of men but only 0.5% of women. The most common type is difficulty

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