Trivex Index Of Refraction

However, early acrylics were brittle; they would scratch and crack easily, not forgetting how they would often discolor and be cloudy over time. Acrylic is still found in frames along with other things, but aren’t really used as eyewear lenses anymore, because of improvements in plastics like CR-39. Just as you use sunscreen to keep the sun’s UV rays from harming your skin, UV treatment in eyeglass lenses blocks those same rays from damaging your eyes. Overexposure to ultraviolet light is thought to be an underlying cause of cataracts, retinal damage and other eye problems. No eyeglass lens material – not even glass – is scratch-proof. Kids’ lenses, especially, benefit from a scratch-resistant hard coat.

• The index of refraction of regular plastic lenses is 1.50.
• Those in the number of 1 1.53 to 1 1.59 are about 20% thinner than regular plastic lenses, whereas 1.74 high index lenses are about half the thickness of regular plastic lenses.
• Discovered that 75% of high prescription patients have a desire to have more attractive and discreet eyeglass lenses.
• Now, it’s up to you to decide which type of lens is most beneficial for you based on your chosen frame as well as your personal priorities.
• To help you experience superior eye protection, sharp vision and lightweight comfort — all in the same lenses.
• the OS lens thinner and being aspheric will helps it be even flatter.

Thankfully, polycarbonate and nearly all high-index plastic lenses have 100 percent UV protection built-in, because of absorptive characteristics of the lens material. Eyeglass lens thickness is set in part by the size and design of the frame you choose. In fact, you can find so many selections for lenses and coatings, that it’s easy to be confused about all of the choices. Typically, CR-39 lenses are widely acceptable as the standard. They’re very reasonable and durable, however they have to have special coatings applied to become scratch-resistant, blue-light reflecting, and UV reflecting. Nevertheless, they’re still typical and offer a lighter, more durable eyewear experience than glass. Introduced during and after WWII,acrylic lenseswere cheaper to produce, more lightweight, and could be manufactured at a mass scale – a crucial necessity during wartimes.
However, to guard your investment in your eyewear, scratch-resistant coating is highly recommended for all eyeglass lenses. The only real exception is glass lenses, which are naturally hard and scratch-resistant. Though these lenses are specially beneficial should you have a strong eyeglasses prescription, they are able to create a noticeable difference in the appearance of virtually any couple of glasses.

Poly And Trivex: Facts And Fiction

Previously, I discussed a few of the advantages of buying eyeglasses from an optical versus online. In NJ, our standards are strict, and we don’t hesitate to remake glasses if they were made incorrectly. Opticians are trained to thoroughly inspect eyewear including the quality, prescription, and appearance of any given order. We guarantee that the patient is getting the product quality they paid for.

• patient less per day than a cheap cup of coffee.
• The ABBE Value is inversely proportionate to the chromatic aberration induced by the separation of light.
• Minimal decentration of lenses in the frame and an inferior ED minimizes the result of chromatic aberration.
• lighter if formed of high index material.
• Aspheric design, when combined with high-index resin, will further thin and flatten both plus and minus powers.

Trivex alongside polycarbonate is ideal for rimless frames and those frames requiring drill mount screws through the lenses. Optical clarity;Trivex lenses have a higher Abbe value and could produce sharper peripheral vision with less chromatic aberration than polycarbonate lenses. Our informal tests show the difference is highly subjective. An abbe value identifies the quantity of chromatic aberration of the lens material. The bigger this number is, the more clarity you’ll experience with the lens. Generally, CR-39 lenses have the highest level of clarity, followed by high index lenses.

Glass Lenses

However, glass lenses are heavy, thick and dangerous if broken and cannot be used in certain frame styles. Some glass can be acquired with a refractive index as high as 1.8 and 1.9. Polycarbonate lenses are lighter than CR-39 and is more impact-resistant. Safety glasses tend to be made with polycarbonate lenses to safeguard the eyes from sawdust, shrapnel, and other hazards.
The 1.50 standard index lenses will be the thickest lenses you can purchase for a standard pair of prescription glasses. These lenses work best for light prescriptions that have superior clarity and fall between -3.00 and +3.00. Due to the conventional 1.50 single-vision index lens properties, the glasses must be a full-rim frame. This sort of frame supports all sides of the lens to reduce and prevent cracking. Trivex offers benefits to your patients that most other lenses cannot. Clarity provides optical perfection with more contrast, sharpness of vision. Strength provides protection from eye injury with high impact resistance.

The entire reading prescription here is +3.75 OD and +4.00 OS. Plus lenses are thickest in the center and thinnest at the edges. The patient’s PD of 56mm means the lenses would need to be decentered 7mm each, which may bring about eyeglasses with lenses inordinately thick both close to the bridge and in the centers. In fact, in this specific case, ordering lenses surfaced to obtain sufficient thickness for grooving at the temporal edge would make the overall lens thickness considerably greater. If you are thinking about obtaining the thinnest, lightest lenses possible, there is no question that high index plastic is the best choice for you.

Lens Materials Abbe Values, & Index Of Refraction

High index lenses bend light better than regular glass or plastic lenses, so less lens material must correct your vision. Trivex lenses likewise have a higher tensile strength than polycarbonate lenses.
Prescription is not the only factor to consider when determining which lenses will be the right option for you personally. You should also consider pupillary distance, frame type, and your lifestyle needs. The lens index, also known as the “refractive index” or the “index of refraction,” may be the measurement of how efficiently the lens bends light. As the strength of one’s glasses prescription increases, the lenses tend to get heavier and thicker. This makes eyeglasses with Trivex lenses exceptionally comfortable to wear and reduces the chance of one’s glasses sliding down the bridge of one’s nose. Abbe value is really a measure of the lens material’s dispersion of light.