Disadvantages Of Photochromic Lenses

What Are Photochromic Lenses?

Photochromic lenses are becoming increasingly popular as they offer several advantages over traditional lens types. However, there are some disadvantages to using photochromic lenses, which should be considered before making the switch. 

In this article, we will explore these disadvantages and discuss whether or not they make photochromic lenses unsuitable for specific uses.

Photochromic lenses can change colour based on the amount of light that hits them. This means they can darken when it's cloudy and lighten when it's sunny. This can be helpful for people who want to wear sunglasses in different conditions. However, photochromic lenses have disadvantages.

Photochromic lenses only work in some lighting conditions. They darken in cloudy or overcast conditions but won't in direct sunlight and can only partially change their colour. They can sometimes become scratched or damaged after being used. Finally, photochromic lenses are not permanent- they will lose their ability to change colour over time due to wear and tear.

How Do Photochromic Lenses Work?

Photochromic lenses change their colour according to the wavelength of light that hits them. When they first become exposed to sunlight, photochromic lenses will start transparent and change colour depending on the colour of light that hits them. The longer the exposure to light, the more permanent the colour change will be.

 Photochromic lenses are used in sunglasses, sunglasses, and contact lens cases because they can provide a more natural-looking eye when used in bright environments. 

There are some disadvantages, though. One drawback is that photochromic lenses do not work in low-light environments, which can be a problem in some situations. Another disadvantage is that photochromic lenses do not work in direct sunlight, which can be a problem for people who wear them for activities like sailing.

Photochromic Lens Temperature Dependency

Photochromic lenses are the perfect option for people who want to change their eye colour but don't want to have to get surgery. However, photochromic lenses are only sometimes the best option for everyone.

One reason photochromic lenses can be less than perfect is that their temperature dependence can be problematic. In other words, if you wear a photochromic lens and go outside in cold weather, the lens will cool down quickly, and you'll likely end up with a very dark eye colour. However, the opposite happens when the lens warms up - in warm weather, the lens will heat up quickly, and your eye colour may become lighter than usual.

Because of this temperature dependence, it's essential to take care when using photochromic lenses. For example, if you go outside in cold weather, remove your lens before going outside and wait until you return inside before putting your lens back on. Or if you're in warm weather and decide to put your lens on early in the day, make sure you wait until later in the day or evening to go outside so that your lens will have time to heat up properly.

Different Photochromic Lens Options

Different photochromic lens options exist, each with its advantages and disadvantages. Here are some of the most common types:

1. UV Photochromic Lenses

UV photochromic lenses work by absorbing ultraviolet (UV) light to change the colour of the lens. This lens is best for outdoors people, as it can help protect your eyes from sun damage. However, they tend to be more expensive than other photochromics and require special care, such as wearing sunscreen and avoiding direct sunlight while wearing the lens.

2. Ultrasonic Photochromic Lenses

Ultrasonic photochromics uses high-frequency sound waves to change the colour of the lens. They're generally less expensive than UV photochromics and don't require special care, but they don't work in bright sunlight. They also have a shorter lifespan than other photochromics, typically lasting around two years before needing replacement.

3. LED Photochromic Lenses

LED photochromics use light energy to change the colour of the lens. These lenses can be turned on or off with a button or wirelessly controlled via an app, making them convenient. They're also one of the most affordable types of photochromics and typically last between 6 and 12 months without requiring replacement. However, they only work in a bit of light and may not wholly darken when exposed to UV light.

4. Liquid Photochromic Lenses

Liquid photochromics use a liquid matrix to change the colour of the lens. This lens type is easy to apply and remove, but it may not be as durable as other photochromics and can't be turned off or controlled wirelessly. They also require special care, such as using special eye drops to keep the lens from drying out, and may only be suitable for some users.

5. Photochromic Sunglasses

Photochromic sunglasses are a type of photochromic lens specifically designed to protect your eyes from the sun. They come in various styles and colours and are typically more affordable than other types of photochromics. However, they only work in a bit of light and may not wholly darken when exposed to UV light.

Disadvantages of Photochromic Lenses

Photochromic lenses work by altering their optical properties in response to light. They are usually made from a light-sensitive polymer that darkens when exposed to light, and then light again causes the lens to revert to its original transparency.

Photochromic lenses have several advantages over traditional sunglasses. 

• They can be used in any condition - sunny or cloudy and are not reliant on sunlight. 
• Photochromic lenses can be lightweight protection from the sun's harmful UV rays. 
• This lens can also be used as sunglasses, providing full eye coverage.
• They are transparent over the most visible spectrum, making them the perfect option for people who want to wear eyewear but do not want to show off their prescription glasses.

However, there are also some disadvantages to using photochromic lenses. 

• Photochromic lenses can only be used for a limited time after they have been exposed to sunlight - usually around two hours. 
• Because photochromic lenses change their opacity in response to light exposure, they may become difficult to see when worn in low-light conditions or at night. 
• They are more expensive than standard sunglasses and may only be compatible with some eyeglasses frames.
• Photochromic lenses cannot filter out all types of glare; therefore, you may need additional eye protection, such as sunglasses or a reflective vest, when using them outdoors.

Conclusion

Photochromic lenses are a type of lens that can change their colour based on the light exposure they receive. This technology is popular because it allows people to switch between sunglasses and regular eyeglasses without taking off their sunglasses or changing into regular eyeglasses. 

Most photochromic lenses require wearing sunglasses or eyeglasses while in use, but some models have a built-in screen that you can use without glasses. Photochromic lenses are available in various colours and styles to suit everyone's needs and preferences.

However, photochromic lenses have some disadvantages that should be considered before deciding to buy them.

Photochromic lenses can be expensive, but they're usually worth the price. In addition, they last longer than regular sunglasses and don't require cleaning or maintenance. 

Nevertheless, photochromic lenses are a great way to stay safe in the sun and enjoy outdoor activities without worrying about the risk of eye damage.