Never plug your computer into the same circuit as a major motor-driven appliance such as a furnace, freezer, dishwasher, air conditioner, or refrigerator. A multi-outlet electrical power strip may not have surge protection built into it. Also, don't forget about the phone line. It should be protected to avoid lightning or other electrical pulses entering the computer through the phone line. To avoid losing data from a power outage, you can buy a battery backup system, known as an uninterruptible power supply, or UPS, which will keep your PC running for about an hour after the power goes out for any reason.
Lighting is a critical consideration.
Eye strain can occur if you are using a computer in an improperly lit area. Light from nearby windows, overhead fixtures or desk lamps can cause glare on a PC screen, making it difficult for eyes to adjust. To reduce screen glare, adjust the lighting in your workspace. Make sure bulbs aren't too bright and your windows have curtains or shades to block excessive outside light. A small desk lamp using one 60-watt incandescent bulb placed well to the side of the screen is usually sufficient.