Sometimes known as reactor lenses.
Photochromic lenses darken on exposure to sunlight and protect the eyes from ultraviolet radiation.
Good photochromic lenses block out 100% of the most harmful rays of the sun, all of the time, reacting to light changes in seconds.
Sunglasses are not always convenient in changing light conditions.
Photochromic lenses offer flexibility, protecting the eyes under all light conditions.
They are made in your normal prescription so your spectacles will correct your vision and give UV protection.
Photochromic lenses meet all your various needs by combining the benefits of prescription spectacles / contact lenses and sunglasses.
Photochromic lenses are available in glass and plastic.
Recent innovations mean that plastic lens performance has caught up with glass lenses.
Ask your optometrist or dispensing optician about the latest product and tint range for you particular prescription.
Photochromic lenses can be treated with hard coating, anti-glare and water repellence making them perfect for sports.
If you regularly encounter periods of extreme heat and high levels of UV you should consider a pair of prescription sunglasses made to the British Standard 2724.
However photochromic lenses are still the most versatile option for most people.
To keep your lenses clean, always follow the advice from your practitioner for your specific frames and lenses.
Always use two hands to remove your spectacles, using even pressure on both side pieces.
Keep your glasses in a case.
Always Open the case, lenses rubbed on the case can dull.