CR39, also known as allyl diglycol carbonate (ADC), is a type of plastic material commonly used in the production of eyeglass lenses. It has higher abbe value and excellent optical clarity, is available in virtually all lens types.
The CR-39 Plastic lens material is a great choice for lower prescriptions and full-rimmed frame applications, is more popular for prescription eyeglass lenses for many years.
Plastic vs Polycarbonate Lenses vs Glass Lenses
Plastic Lenses
- Made from lightweight plastic, such as CR39.
- Prone to scratching and damage.
- Good optical clarity
- Thin and light
- Need additional coatings to against UV
- Usually more budget-friendly.
VS
Polycarbonate Lenses
- Made from polycarbonate
- Highly impact-resistant
- Good optical clarity
- Thinner and Lighter
- Offer built-in UV protection
- Higher-priced
VS
Glass Lenses
- Made from glass
- Scratch resistat but easily break
- Outstanding optical clarity
- Thicker and heavier
- Provide some UV protection without coatings
- More expensive
Types of CR39 Plastic Lenses
CR-39 lenses come in different types to meet various optical needs and preferences.
Single Vision Lenses »
- All of the lenses are made with a single prescription power.
- They are commonly used for correcting nearsightedness (myopia) or farsightedness (hyperopia).
- Depending on the prescriptions, single vision lenses can be used for distance vision or near vision in reading, or computer use.
- CR-39 bifocal lenses have two distinct prescription areas on the same lens.
- While the lower portion is used for close-up tasks like reading, the upper portion corrects distance vision.
- Bifocals are suitable for individuals who have both near and far vision correction needs.
Progressive Lenses »
- Progressive CR-39 lenses offer a smooth transition between near and distance vision correction. They are often referred to as no-line bifocals or multifocal lenses.
- The prescription strength of multifocal lens changes from the top to the bottom of the lens.
- Progressive lenses are a popular choice for those who need multifocal correction without the visible lines of standard bifocals.
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Frequently Asked Questions
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Are glass lenses better than plastic lenses in eyeglasses?
Glasses lenses or plastic lenses are in different demands. If prefer lenses in lightweigt and less costly, you can choose plastic lenses. While glasses lenses will be a better choice for durable and scratch-resistance.
Can we remove scratches from coated plastic lenses?
Scratches can’t be removed from any eyeglass lens and anti-scratch coatings can not be removed either. You should replace the lenses if you discover scratches on them.
Which is better polycarbonate or plastic lenses?
The choice depends on your priorities and needs. Plastic lenses are more affordable and have good optical clarity, while polycarbonate lenses are more safe and have a stronger impact resistance.
How much UV light do CR39 plastic lenses block?
CR39 plastic lenses can typically block around 10% of UVB rays and 60% of UVA rays without any additional coatings. However, it’s recommended to have an anti-UV coating put to your CR39 lenses for complete UV protection, since this can greatly boost their ability to filter UVA and UVB radiation. These coatings can provide up to 100% UV protection, protecting your eyes from the harmful effects of UV radiation.
How do you clean plastic lenses?
In order to clean plastic lenses effectively, rinse them with lukewarm water, then use a mild dish soap or lens cleaning solution. Rub the lenses gently, rinse again to get rid of the cleaning solution, dry with a microfiber cloth, and inspect for smudges. Steer clear of abrasive items, strong chemicals, and your breath when fogging. Your plastic lenses will remain clear and long-lasting with proper maintenance and cleaning.
Are plastic lenses bad for your eyes?
There is no evidence to suggest that plastic lenses are healthy for your eyes. In fact, since plastic is strong and lightweight, many eyeglass lenses are made of plastic materials. However, it’s crucial to ensure that your glasses are correctly set to your eyes because misfitting spectacles can result in headaches, eye strain, and other problems. Additionally, it’s important to take good care of your eyeglasses and keep them clean because some plastic lens materials may be more prone to scratches or other damage.