Ethan Clarke
Uncoated plastic lenses are a popular choice for eyeglasses due to their affordability and durability. Plastic lenses are lightweight, less likely to break or shatter than glass, and provide good optical clarity. However, they are more susceptible to scratches and only offer partial protection from UV rays. Coatings can be added to plastic lenses to enhance their scratch resistance and UV protection. These coatings can also provide anti-reflective properties, reducing glare and increasing the transmission of contrast, definition, and perceived sharpness. The removal of coatings from lenses can also be done to achieve a 'vintage' look in photography, producing a unique flare effect.
| Characteristics | Values |
|---|---|
| Cost | Low |
| Durability | Durable |
| Weight | Lightweight |
| Thickness | Thicker than polycarbonate lenses |
| Scratch resistance | Scratch-resistant coating can be added for an additional cost |
| UV protection | Offers partial protection from UV rays; a UV coating can be added for full protection |
| Clarity | Good optical clarity |
| Vision distortion | Does not cause much visual distortion |
| Image effects | Produces a 'kind' and benign tone with the ability to attenuate some of the digital harshness in cheaper ranges of large sensor cameras |
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What You'll Learn
- Plastic lenses are lightweight, durable, and less expensive than polycarbonate lenses
- Uncoated lenses have a vintage look, but coatings can be added to reduce flare and increase contrast
- Anti-reflective (AR) coatings can reduce unwanted reflections and increase contrast
- Scratch-resistant coatings can be added to plastic lenses for additional protection
- Plastic lenses offer partial UV protection, but a coating can be added for 100% protection
Plastic lenses are lightweight, durable, and less expensive than polycarbonate lenses
Uncoated plastic lenses are a popular option for prescription glasses. They are lightweight, durable, and less expensive than polycarbonate lenses.
Plastic lenses, also known as CR-39 ("Columbia Resin 39"), were first introduced in 1947 and have since become a widely used material for eyeglass lenses. The lightweight property of plastic is one of its biggest advantages, making it a comfortable choice for extended wear. The raw materials for manufacturing plastic are relatively inexpensive and easy to obtain, making plastic lenses a cost-effective option for consumers.
In terms of durability, plastic lenses are less likely to break or shatter compared to traditional glass lenses, making them a safer option for everyday use. They also offer good optical clarity and do not cause significant visual distortion. However, plastic lenses are more prone to scratches and may feel heavier on the face for those with higher prescriptions due to their thickness.
Polycarbonate lenses, on the other hand, are thinner and provide UV protection. They are also durable but tend to scratch easily, requiring a scratch-resistant coating. Polycarbonate lenses are often recommended for individuals who spend a lot of time outdoors due to their UV-blocking properties. However, they are generally more expensive than plastic lenses.
Ultimately, the choice between plastic and polycarbonate lenses depends on various factors such as personal preference, cost, weight, durability, and scratch resistance. While plastic lenses may be more affordable and lightweight, polycarbonate lenses offer thinner designs and inherent UV protection.
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Uncoated lenses have a vintage look, but coatings can be added to reduce flare and increase contrast
Uncoated plastic lenses are a popular choice for eyeglasses due to their low cost and durability. They are lightweight, provide good optical clarity, and are less likely to break or shatter compared to glass lenses. However, they are more susceptible to scratches and only offer partial protection from harmful UV rays.
The lack of coatings on plastic lenses can result in a unique "vintage" look. This effect can be desirable for those seeking a classic aesthetic. By removing the coatings, the lenses produce a distinctive flare and reduce contrast, creating a softer and more subtle image. This characteristic is especially noticeable in challenging lighting conditions, such as when a strong light source is within the frame.
On the other hand, coatings can be added to plastic lenses to enhance their performance and reduce unwanted effects. Anti-reflective (AR) coatings, for example, are designed to reduce reflections and increase the transmission of contrast, resulting in improved definition and perceived sharpness. These coatings can be particularly beneficial for individuals who frequently drive at night or work with computers, as they reduce glare and enhance visibility.
Additionally, scratch-resistant coatings can be applied to plastic lenses to improve their durability and extend their lifespan. For individuals who plan to wear their glasses outdoors frequently, a UV coating is essential to ensure 100% protection from harmful UV rays. Tinted coatings are also available to suit various lighting conditions, such as lenses that transition from clear indoors to dark outdoors.
While coatings offer functional benefits, they also influence the overall appearance of the lenses. The choice between uncoated and coated lenses ultimately depends on the wearer's preferences, lifestyle, and specific vision requirements. It is important to consult with an eye care professional to determine the most suitable lens options, coatings, and frames for optimal visual comfort and eye health.
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Anti-reflective (AR) coatings can reduce unwanted reflections and increase contrast
Uncoated plastic lenses are an affordable option for people with low prescriptions. However, they may not be the best choice for those seeking to reduce unwanted reflections and increase contrast. This is where anti-reflective (AR) coatings come in.
AR coatings are applied to the surface of lenses to reduce reflections and improve efficiency. When light passes through an uncoated lens, approximately 4% of the light is reflected at each interface, resulting in a total transmission of only 92% of the incident light. With an AR coating, almost 100% of light can pass through, reducing reflective light and increasing the amount of light that reaches your eyes.
This reduction in reflections also improves the contrast of the lens by eliminating stray light. In complex systems such as cameras, binoculars, telescopes, and microscopes, AR coatings enhance the image quality by reducing unwanted light degradation. Additionally, AR coatings can help reduce eye strain by making it easier for your eyes to view small patterns and letters.
AR coatings are composed of microscopic layers of metallic oxides, applied using vacuum coating technology. They are designed to have a relative phase shift between the beams reflected at the upper and lower boundaries of a thin film, resulting in destructive interference that cancels out the beams. This technology improves the performance of optical systems, although using the coating outside of its designed wavelength range could decrease performance.
Overall, AR coatings are an effective way to reduce unwanted reflections, increase contrast, and enhance visual acuity and image quality. They are a valuable addition to lenses, improving both cosmetic appearance and vision.
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Scratch-resistant coatings can be added to plastic lenses for additional protection
Uncoated plastic lenses are lenses that do not have any additional treatments or coatings. Coatings are often applied to lenses to reduce flare, increase the transmission of contrast, and improve perceived sharpness. They can also be used to reduce unwanted reflections, which can increase the contrast of the lens.
One of the most common coatings is an anti-reflective (AR) coating, which is particularly recommended for polycarbonate and high-index lenses, as they reflect more light than regular glass or plastic lenses. Aspheric lenses, which have flatter curves than regular lenses, also benefit from AR coatings as they often cause more noticeable reflections.
Another type of coating that can be added to plastic lenses is a scratch-resistant coating. This type of coating helps to protect the lenses from scratches that can occur from dropping the glasses or cleaning them with an abrasive cloth. While scratch-resistant coatings can provide additional protection, they do not guarantee that the lenses will never scratch. It is still important to take proper care of the lenses and store them in a case when not in use.
Scratch-resistant coatings are commonly included as a standard feature by many opticians, especially for premium lenses with additional coatings. They are usually included in the price of the glasses, but some upgraded lens packages may offer more robust scratch resistance for an additional cost. It is worth noting that even with a scratch-resistant coating, lenses can still be vulnerable to scratches, and proper care is necessary to maintain their condition.
In addition to scratch resistance, other types of coatings can be applied to plastic lenses for specific purposes. For example, an anti-fog coating can be beneficial for those who live in cold climates or work in emergency response roles, as it prevents lens fogging when transitioning between different temperature environments.
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$12.19 $14.39
Plastic lenses offer partial UV protection, but a coating can be added for 100% protection
Plastic lenses, also known as CR-39 ("Columbia Resin 39"), have been widely used in eyewear since the 1970s. They are a popular choice for prescription glasses due to their low cost, durability, and lightweight nature. While plastic lenses do offer some UV protection, it is only partial, and a UV coating is required to achieve 100% protection.
CR-39 lenses are inherently scratch-resistant, but additional coatings can be applied to further enhance this property. These coatings can also serve cosmetic purposes or improve comfort and safety. For example, an anti-reflective (AR) coating can be applied to reduce unwanted reflections and increase the contrast and perceived sharpness of the lens. This is particularly beneficial for individuals with higher prescriptions who may experience surface reflections and colour fringing.
The type of coating selected depends on individual needs and preferences. During an eye exam, an eye doctor can recommend the most suitable option based on the patient's prescription and lifestyle. For those who spend a lot of time outdoors or have strong prescriptions, polycarbonate lenses may be a preferable alternative to plastic. Polycarbonate lenses are thinner, more lightweight, and provide 100% UV protection without the need for an additional coating.
However, polycarbonate lenses are more expensive and prone to scratches, requiring a scratch-resistant coating to prolong their lifespan. They may also cause distorted peripheral vision in individuals with stronger prescriptions. As such, it is essential to consider the benefits and drawbacks of each lens material and coating option to make an informed decision.
In summary, while plastic lenses offer partial UV protection, adding a UV coating is necessary to achieve 100% protection. This coating is especially important for individuals who spend significant time outdoors and are at risk of UV-related eye damage.
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Frequently asked questions
Uncoated plastic lenses are lenses that do not have an anti-reflective (AR) coating. This coating is applied to both sides of a lens and reduces the amount of light reflected off the lens's surface.
Uncoated plastic lenses are a good option for those who want a "`vintage' look." They are also a low-cost option for people with low prescriptions.
Coated lenses reduce flare and increase the transmission of contrast, definition, and perceived sharpness. They are especially useful for those who often drive at night or read on computers.
Uncoated lenses are more susceptible to scratches and offer only partial protection from harmful UV rays.
Alternatives to uncoated plastic lenses include polycarbonate lenses and high-index lenses, which are thinner and lighter than plastic lenses. However, polycarbonate lenses are more expensive and have lower optical quality than plastic lenses.
