Follow the 20-20-20 rule. Eyestrain while using computers is caused by continuous work. Hence we should take a little break. After every 20 minutes, look at an object 20 feet away for 20 seconds. Also have proper illumination in the room especially around the monitor. Use anti glare screens for your monitor.

Monitor should be placed at eye level or slightly below. Chair should be at a comfortable height with feet slightly raised from the floor.
Anti-reflection coating will help only if you are already wearing glasses. There is no need to wear a zero power anti reflection-coated glass.

There is no safety standard for spectacle lens in India, though many eyes are lost in accidents due to glass shattering and injuring the eye.

The US FDA standards require a spectacle lens to withstand an impact of 16 gm steel ball dropped from a height of 127 cms. Any plastic lens satisfies this. Hence they are very safe for the eyes. Industrial safety norms are different.

Imagine what can happen to your eyes, which are 0.50 mm thin at the front, if a foreign particle hits the eye at 70 KMPH??? It is always advisable to have a protective gear either a helmet or driving glasses to protect the eyes from dust and UV rays.

Monitor should be placed at eye level or slightly below. Chair should be at a comfortable height with feet slightly raised from the floor.
Anti-reflection coating will help only if you are already wearing glasses. There is no need to wear a zero power anti reflection-coated glass.

Unfortunately you as a consumer can never assess the quality of the specs 0r lenses. Only the person who orders them knows what he is giving.

Few basic tests are – The reflection of a tube light in the front surface of the lens should not be distorted. The lens should be free of any bubbles or surface irregularities.

This depends on your requirement, prescription and finally on your budget too. Assess your options within in your budget and discuss with your Optician, who should be able to pick the proper one for you.

Just as a cup of coffee if priced differently at various coffee shops – glasses may differ in prices depending on the quality of the frame and lenses provided. Price also varies based on the lens enhancements offered, whether the lenses are fitted on hand edger or fully automatic edger. Unfortunately for your eyes all glasses may look the same, but may have different prices, as they vary in quality. At times the price may be just double for an ophthalmic grade product as compared to a local one.
Also an optical store may price their product depending on the services they offer, and their educational qualifications too.
Please remember –look for the best value rather than cheapest cost.