Keyboard, mouse, monitor

INPUT DEVICES:

🔸KEYBOARD

🔸MOUSE

INPUT DEVICES:

An input devices is any hardware device that sends data to the computer, without any input devices, a computer is just like a TV only be a display.

KEYBOARD:

When you use your keyboard, your upper arms should be relaxed and your elbows bent at a right angel or 90 degrees and your wrists straight.

CONTAINS:

A keyboard contains keys for letter and numbers as well as for specialized task (such as Enter, Delete,ect).

TYPES:

🔹Keyboard on same plane as forearms

🔹Tilt keyboard

🔹Negatively tilted keyboard

MOUSE:

Mouse should be at the same level as the keyboard so it can be easily reach. When you change your hand, automatically you are using different muscle. Mouse was develope as a pointing device. A mouse resides on a flat surface, and, by moving the mouse you can move the pointer on the screen.

CONTAINS:

🔸Buttons: allow you to enter instructions by clicking. 

🔸Wheel: for scrolling upward and downward.

In laptops, the  Ouse is actually substituted with a touchpad or trackpad. This is a specialized surface that follows the motion of your finger. You can still connect an external mouse to a laptop if you prefer.

MONITOR:

🔹GLASSES AND BIFOCALS

🔹LIGHTING AND GLARE 

GLASSES AND BIFOCALS:

The monitor will need to be even lower. Depending on vision levels, and the amount and type of computer work being done, people have found that a secon pair of glasses for computer-use only works better. Another alternative is to have a computer prescription in the upper part of the lens. Your optometrist will be able to determine the best solution, based on your vision.

LIGHTNING AND GLARE:

How can eye discomfort be reduced?

Overhead lighting

• Use filters to diffuse overhead lighting.
• Dim overhead lights.
• Keep in mind that recommended level of light in offices 300 - 500 lux is not a must. It applies in the situation where there is no task lamp in use.

Windows 

• Cover windows with adjustable blinds.

Monitor

• Adjust the brightness and contrast according to your preference.
• Use a light colour for the background.
• Place the monitor parallel (not directly below) with overhead lights.
• Angle the monitor away from lights and windows.
• Make sure that the task lamp illuminates the document and not the monitor.

REFFERENCE:

https://www.osha.gov/SLTC/stools/computerworkstations/components_monitors.html