When you order new glasses, you are often offered a list of lens upgrades. Some are genuinely useful. Others matter less than the marketing suggests. Here is a plain guide.
Anti-reflective (anti-glare) coating
Worth considering for most people. It reduces reflections on the lens surface, so others see your eyes clearly and you see less glare from headlights, street lights and screens.
Blue light filtering lenses
Optional. Screens give off much less blue light than the sun, and there is no strong evidence that screen blue light damages the eyes. Studies have not shown that blue-filter lenses reduce digital eye strain. Regular breaks, blinking and the right prescription help far more. If you like the feel of these lenses, they are not harmful.
Photochromic lenses
These darken outdoors in sunlight and clear indoors. They are convenient if you move between indoors and outdoors often. They darken less inside a car, because windscreens block much of the UV that triggers them.
Polycarbonate and Trivex lenses
These are lighter and much more impact-resistant than standard plastic. They are a good choice for children, sport and anyone who is hard on their glasses.
High-index lenses
For higher powers, high-index materials make lenses thinner and lighter, which looks better and feels more comfortable.
Progressive lenses
After about 40, most people find it harder to focus up close. Progressive lenses give distance, intermediate and near vision in one lens without a visible line. Expect one to two weeks to get used to them. Office or computer lenses are another option if you spend long hours at a desk.
UV protection
Most modern lenses block UV. Good sunglasses with UV protection are important outdoors, especially for people who spend long hours in the sun.
The most important step is an accurate prescription. Book an eye check-up before buying new glasses.
Frequently asked questions
Why do my new glasses feel strange?
It can take a few days to adapt to a new prescription or frame, and up to two weeks for progressive lenses. If discomfort continues, have the prescription and fitting rechecked.
Do I need separate glasses for the computer?
Not always. If you are over 40 and struggle at screen distance, computer or office lenses can make long working hours more comfortable.
Sources
This article is for general information and does not replace an examination by an eye doctor. If you have symptoms, please book a consultation.