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Doctor insights on: What Are High Index Lenses

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What are high index lenses?

What are high index lenses?

Plastic lenses: These are eyeglass lenses made of a plastic which will bend light more than the usual plastic. Because of this, a thinner lens is possible and has the advantage, being plastic, of being lightweight although somewhat susceptible to scratching. ...Read more

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Could you tell me what happens if you use high index lenses on a low prescription?

It will work: High index will simply bend light more for a given degree of optical need. If you have a low prescription, the lens will in this case be thinner than a lower index. There will be no difference in the quality of the image. ...Read more

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'm currently wearing 1.67 high index lenses with no anti glare coating. Is it reasonable to think that?

'm currently wearing 1.67 high index lenses with no anti glare coating. Is it reasonable to think that?

Most likely: The anti glare coating will give you a little more visual comfort but is not essential. It is like the anti-reflective coating that looks greenish on a camera lens. The vision will be ever so slightly more sharp this way. ...Read more

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I was wondering what are the differences between polycarbonate, polycarbonate aspheric, and 1.67 high index lens?

I was wondering what are the differences between polycarbonate, polycarbonate aspheric, and 1.67 high index lens?

Lens materials: Polycarbonate and 1.67 high index are different types of plastics used to make lenses for glasses. Aspheric is a type of lens design. Generally the higher index of the plastic, the thinner the lens can made. Higher index materials may induce more distortion in the periphery of the vision. ...Read more

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Can an astigmatism prescription of 2.25x100 require a high index lens?

Can an astigmatism prescription of 2.25x100 require a high index lens?

No: This could easily be done with a standard lens material. High index is nicer because it is thinner and lighter, but more expensive. ...Read more

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Hi docs, would high index lenses make my eyes smaller?

Hi docs, would high index lenses make my eyes smaller?

No: It is the power of your prescription that will make your eye look smaller or larger. ...Read more

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Please tell me how long it takes for to get used to high index lenses?

Please tell me how long it takes for to get used to high index lenses?

Rapid adjustment: Your eye will find almost difference between normal and high index lenses so the adjustment is minimal. High index simply allows you have a lighter lens pressing on your nose. ...Read more

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Help, what type of lenses should I get for a high prescription?

Help, what type of lenses should I get for a high prescription?

Thin grind: Not sure of your age, however, thin grind edges will reduce the thick lens appearance. See your local optician and ophthalmologist to go over your options. ...Read more

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My periodontal hygienist wears high powered lenses that she removes when finished. Others tell me their hygienists do not use them. Benefits?

My periodontal hygienist wears high powered lenses that she removes when finished. Others tell me their hygienists do not use them. Benefits?

Better vision: Magnification loupes allow your hygienist to see better--it's the difference between her looking at teeth at normal size vs baseball size. That means she can see more detail, which should allow her to provide a more detailed cleaning. Cleaning teeth is not just visual, though--a lot is done by feel, especially between the teeth. So the loupes can provide a benefit, just not on all areas of teeth. ...Read more

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Polycarbonate vs plastic lenses best for high myope?

Polycarbonate vs plastic lenses best for high myope?

Probably polycarb: Polycarbonate lenses are "high index" lenses. They are often used in high myopes to allow for the glasses to be thinner and lighter. They do have more chromatic aberration though. Discuss the various pros and cons with your optician before deciding what it right for you. ...Read more

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Want to decrease the "coke bottle" effect. What do I do and how much more does high index cost?

Want to decrease the "coke bottle" effect. What do I do and how much more does high index cost?

Glasses: I assume you are referring to glasses and in that cas the person you want to talk to would be a board-certified ophthalmologist. Most have an optical shop in their office and can give you a price for glasses. What I can tell you is to a degree it is worth spending more on a decent pair of glasses especially if you are wanting special lenses like high index or progressive. ...Read more

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Is there a tradeoff between lens thickness and chromatic aberration? If you opt for higher index (more thin), the lower the abbe value tends to be?

Abbe value is the: Refractive efficiency of lens. Lens with high Abbe: disperse light less: less chromatic aberration. High index materials produce lower Abbe hence more chromatic aberration. Abbe values are inversely proportional to the degree of chromatic aberration. High index lenses are thinner and have more chromatic aberration. Yes it's a trade off. ...Read more

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How high or low is the refractive error in a contact lens?

How high or low is the refractive error in a contact lens?

For almost all: Contact lenses are available to correct almost every refractive error, including various levels of myopia, hyperopia, and astigmatism. ...Read more

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Which level of astigmatism is too high for regular contact lenses?

Which level of astigmatism is too high for regular contact lenses?

Up to: 3.5 diopters of astigmatism can be corrected with soft contact lenses. With rigid contacts, any amount of astigmatism can be corrected. ...Read more

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What does it mean if my astigmatism is too high for regular contact lenses?

What does it mean if my astigmatism is too high for regular contact lenses?

Toric lenses: If you have more than 1.00 diopter of astigmatism, you probably won't see sharply in standard spherical soft contact lenses. However you can be fit for either toric soft contacts or rigid gas permeable (rgp) lenses and achieve excellent vision. ...Read more

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Top lenses or solution for high plus prescription glasses?

Top lenses or solution for high plus prescription glasses?

High index: Helps make lenses thinner, solution? To clean? Warm soap and water the best, dry with non scratch cloth. I like the sprays the optical stores have with soft cloth. ...Read more

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What will happen to a person that has an very high cardiac index?

What will happen to a person that has an very high cardiac index?

This is a sign: High out put states can be sign of sepsis, anemia, vitamin deficiency, hyperthroidism, arteriovenous fistulas, etc. Once the abnormal index is noted the a systematic search for cause should be carried ot. ...Read more

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Can you give some examples of foods with high and low glycemic index?

Can you give some examples of foods with high and low glycemic index?

You can look up ex: Example of low glycemic foods and diet can be found on the internet such as sites like diabetes.Org (ada website) under food and fitness. ...Read more

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What healthy foods have a high glycemic index?

What healthy foods have a high glycemic index?

Hi prot, lo sugar,: Of limited practical value. Based on intake of 100gm of isolated food-may not reflect portion size, and may not reflect intake, e.g. Most don't eat 100 gm or rice alone. Once you add meat, or fish, tofu, veggies, beans, nuts, seeds, etc you change the G.I. Aim for no refined sugars or grains, protein in every meal. ...Read more

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Any good way to stay away from foods with a high glycemic index?

Any good way to stay away from foods with a high glycemic index?

Look up diet or food: Check out reputable websites like the ada's diabetes.Org under food and fitness you can find examples of low glycemic foods and help with meal planning. ...Read more