Difference Between 1.74 And 1.67 Lenses

Your prescription could frequently change in the first stages leading to multiple costly lens changes. Occasionally, the retailer or your local optician could have a buyer satisfaction policy that protects you from lens changes for a period of days, usually 30 – 60 days. Determining which lens is right for you can be quite a bit confusing but remember that the higher the index number, the thinner and lighter the lenses are. Of course, we always recommend seeing your eye doctor before choosing the new lens to make certain you are finding the right lens for your specific needs.

Lens index is a measurement on the lens thickness chart that dictates the thickness of your lenses. Made from higher-quality material, a higher index lens will be able to deliver better correction with no need for thicker lenses. All lens materials block some light from passing through the lens. This light reflects back from the lens surface, causing distractions and reducing the clarity of night vision. It isn’t unusual for 1.67 high-index lenses and 1.74 high-index lenses to cost 3x to 4x the cost of standard plastic or glass lenses. Also, note that OTC reading glasses should only be used with a lens magnification of +3.00 or less. Anything stronger and we recommend visiting your eye doctor to get their recommendation before purchasing.

How To Choose The Right Glasses Lens

It’s easier to avoid thick lens edges through careful frame selection and selection of materials whenever possible. A “sweet spot” exists at and around the optical center of lenses within which chromatic aberration is more tolerable. Minimal decentration of lenses in the frame and an inferior ED minimizes the result of chromatic aberration.

• For more information about Standard vs. Free-form lenses, watch this helpful video.
• High-index lenses are eyeglass lenses that are designed to be thinner and lighter than regular lenses.
• Whether high-index lenses will be the best choice for you depends on a couple of things, including your prescription, the type of frame you decide on, and how sensitive your eyes are.
• Farsighted glasses can easily become quite heavy, and by using lighter lenses, the glasses are usually more comfortable.
• High index lenses have a higher index of refraction than regular lenses, which means they don’t need to be as thick around the edges to work.

Referred to as the index of refraction, this is a ratio used to determine the speed at which light passes by way of a given lens material. Because high index lenses can transmit and bend light better than standard lenses, they may be made considerably thinner and lighter. CR-39 plastic is often referred to as standard, regular, or plastic lenses.

Impact

The 1.56 Mid-Index lenses are automatically included in our frame prices. In other words, if you visit a $5.95 couple of frames, the price not merely includes said frame but additionally 1.56 lenses with it! These use prescriptions which range from -3.00 to -3.75 and +3.00 to +3.75. They are recommended for full-rim eyeglass frames and glasses worn when taking part in sports. The bigger the index of refraction, the thinner your lenses will be.

Created for high prescriptions, these lenses are really thin and light, delivering tremendous optical quality due to an aspheric design. It’s one of many thinnest and flattest plastic lens available, which are astonishing around 40% thinner than 1.50 index lenses.

ZEISS DriveSafe Lenses Help your patients to see every detail on the road and address the visual challenges of glare, low light and dynamic vision. Lenses, high index lenses are strong and a solid option for drill mounts. While we get plenty of training on these services I find that most of us question when to use high-index lenses and why. Finding a retailer of good quality high index lenses can take a little digging.