WHAT ARE PHOTOCHROMIC LENSES?
Photochromic lenses are normal lenses, but they automatically become dark when we move in the sunlight. However, ultraviolet rays coming from the sun affect the molecules present in the photochromic lenses, which change their colours.
Photochromic lenses are eyeglass lenses that are clear (or nearly clear) indoors and darken automatically when exposed to sunlight. However, photochromic lenses include light-adaptive lenses, “light intelligent,” and “variable tint lenses”. Moreover, photochromic lenses are activated by ultraviolet radiation from the sun and turn clear again after moving indoors. They are offered in various materials, lens colours, and lens treatments. Transcription lenses can be used in prescription, progressive and bifocal glasses.
WHAT ARE PRESCRIPTION SUNGLASSES?
Prescription sunglasses are used for vision correction, such as with reading glasses and glasses used for nearsightedness. Moreover, prescription sunglasses provide eye protection against flying debris for construction workers or lab technicians. These glasses may have protection from the sides of the eyes as well as in the lenses. In addition, some of the safety glasses are used to protect against visible and near-visible light or radiation.
Prescription eyeglasses do not provide sufficient protection from the harmful rays of the sun. Therefore, it is used when spending a longer period in the sun.
TYPES OF PHOTOCHROMIC LENSES
- Transitions signature: These are the most recommended adaptive lenses and are ideal for everyday use to enhance vision. Moreover, the lenses are fully clear when indoors or at night.
- Transitions extractive lenses: These are everyday-adaptive lenses that maintain a hint of tint indoors and reach superior darkness in changing light conditions outdoors. However, this lens works best while driving because they respond to both natural and UV light.
- Versatile photochromic glasses continuously adapt to changing light and reduce eye strain. The glasses reduce sensitivity to light and protect from UV rays. The lenses change colours in response to the brightness outdoors.
These lenses offer advanced and adaptive technology with a standard of eye protection, visual comfort, visual quality, and performance.
TYPES OF PRESCRIPTION GLASSES
- Single vision lenses: these are the cheapest and most common type of eyeglass lenses. However, they have the largest field of vision because they only correct vision at one specific distance.
- Bifocal lenses: are multifocal, which means they have two different “powers” in them—these different sections of the lens correct distance vision and near vision.
- Trifocals lenses: are similar to bifocals, except they have additional powers to correct intermediate vision and can be used to view a computer screen.
- Progressive lenses: these works for anyone who needs bifocals or trifocals. They provide the same correction for near, intermediate, and distance vision without the lines between each section.
FEATURES OF PHOTOCHROMIC LENSES
- It helps to reduce eye strain and eye damage by blocking up to 100% harmful UVA/UVB light.
- Photochromic lenses are cost-effective. It has the future of both lenses (normal lens and sunglasses).
- Photochromic lenses also protect our eyes from the high risk of cataracts by blocking out as much light as possible.
- The glasses are very convenient to carry as you do not need different glasses for different lighting conditions.
LIMITATIONS OF PHOTOCHROMIC LENSES
- Some photochromic lenses are not polarized, leading to harsh glares of sunlight.
- Photochromic lenses get darken when coming in contact with the sunlight, blocking your windshields. Therefore, they are risky to wear while driving.
- Photochromic lenses are also affected by the weather. This means that it takes more time to get dark in the winters.
ADVANTAGES OF PRESCRIPTION GLASSES
- Avoid eye infections: sunglasses with contact lenses prevent eye infections, specks of dirt, and other debris underneath the contacts.
- More comfortable: prescription glasses are more comfortable and free from irritation
- Save money: prescription sunglasses helps you save money by avoiding wearing contacts with your glasses. It helps to save you some money.
- It controls transition lenses: prescription glasses will darken in a car and in other areas where UV light is blocked by glass.
DISADVANTAGES OF PRESCRIPTION GLASSES
- Prescription glasses are more expensive; you will need to account for the higher cost of prescription sunglasses when budgeting.
- You’ll need to carry an extra set of glasses. However, it would be best if you remembered to bring your normal and prescription glasses whenever you’re going out. This can take some getting used to but will start to feel more natural over time.
- A prescription may change at some certain time: it’s a bit hard to change the prescription In your sunglasses. It’s also something to consider if your eyes and the prescription are still changing.