Download A Colour Atlas of Optic Disc Abnormalities by Erna E. Kritzinger PDF

By Erna E. Kritzinger

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A similar situation can be seen in many office situations where the vision of a worker is compromised and they must adapt their posture to ease the strain on the visual system. If an older worker is using glasses (single vision) which are designed for a 16-inch viewing distance, they must lean in toward a screen which may be 20–25 inches away in order to clear the image. If the same worker is using traditional bifocals, which are designed to see the near object in the lower visual field, they must tilt their head backward and lean forward to put the viewing section of the lens into proper position to see the screen.

However, caution should be exercised when evaluating monitors by manufacturer resolution numbers alone. The dpi can be used as a meaningful comparison of monitors as long as the character sizes are the same. If, however, a denser pixel arrangement only results in smaller letters on the screen because the pixels allocated to each letter are the same with either pixel density, then there are no gains in image resolution. In general, and in most applications, there are resolution advantages to using more pixels.

If the image focuses in front of or behind the retina, it will strike the retina in an unfocused state, creating the subjective symptom of blur. This process is true for all distances with the viewing range of the human eye, which we routinely consider from within 20 feet to 16 inches. 40 Visual ergonomics in the workplace We consider the 20-foot distance optical ‘infinity’ due to the angulation of the light rays which emanate from that point. Whenever we direct our gaze to some point within 20 feet, we must activate our focusing mechanism to increase the focal power of the eye and regain the clear image on the retina.

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