![]() Your shoulder and neck muscles are continually being used to lift the arm away from your body if the mouse is placed too far away.Hand and arm muscles must work continually to keep the device steady. Your finger and forearm muscles may become sore if you use a pointing device at a setting that is so sensitive that it is hard to control.Computer work seldom requires this type of strenuous exertion, but there are tasks that require concentrated force that can affect smaller, localized muscle groups. Computer monitors should be periodically cleaned and dusted.įorce is usually thought of as a strenuous physical exertion, such as when lifting a heavy weight or pushing a heavy load.Computer workstations should be isolated from other equipment that may have electrostatic potentials in excess of +/- 500 volts.Dust accumulation, which is accelerated by magnetic fields associated with computer monitors and can reduce contrast and degrade viewing conditions.Electromagnetic fields caused by other electrical equipment located near computer workstations, which can result in display quality distortions.Monitor support surfaces should allow the user to modify viewing distances and tilt and rotation angles.įactors that reduce image quality make viewing more difficult and may lead to eye strain.NOTE: Tilting the monitor back may create glare on the screen from ceiling lighting and a glare screen may be needed. A temporary solution involves tilting the monitor back slightly by placing a book under the front edge. This is most easily done if the monitor has a riser/swivel stand. Tilt the monitor so it is perpendicular to your line of sight, usually by tilting the screen no more than 10 to 20 degrees.As with a monitor that is too high, this can fatigue muscles that support the head. This causes them to tilt the head backward to see a monitor that may otherwise be appropriately placed. Be sure that you have adequate space for your thighs under the desk and that your feet are supported.īifocal users typically view the monitor through the bottom portion of their lenses. Elevate your line of sight by raising your chair.Generally, placing the monitor on top of the computer case will raise it too high for all but the tallest users. Remove some or all of the equipment (computer case, surge protector, etc.) on which the monitor may be placed.Using very large monitors also may increase the angle. In the reclining posture the straight forward line of sight will not be parallel with the floor, which may increase the downward viewing angle. The entire visual area of the display screen should be located so the downward viewing angle is never greater than 60 degrees when you are in any of the four reference postures.The center of the computer monitor should normally be located 15 to 20 degrees below horizontal eye level (Figure 6). The top of the monitor should be at or slightly below eye level.A trial version is available on the xScope site and the full version is on sale in the Mac App Store for $19.99 (reg. It’s incredibly useful, always there when you need it to make perfecting pixels a little easier. The elements feel native and look fantastic for designers, no matter what you design on a Mac, this tool is meant for you. ![]() I like xScope because it feels right at home with OS X. While using xScope, a designer can use the floating tool palette, key commands and the menu bar icons. Vision simulation lets xScope simulate user vision problems such as some blindness and presbyopia, and this has also been built into the Loupe tool. Like previous versions of xScope, the app has minimum visual footprint as it lives in your menubar (although it fills space up quickly with different icons) if you do not have the app open in the foreground. Holding down the Control key while dragging screens now snaps to the edges of the content. The Screens tool has platform sizes organized for iOS, Mac, Android, Windows and TV, with new resolutions including the very latest Mac and iOS models.
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