High index lenses are thinner, more powerfullenses. The difference between your glasses' lensindex can make a huge impact. Deciding which you shouldget depends on your prescription and your lifestyle. Thickerlenses are more affordable, but can only accommodate lowervision correction needs..
In this regard, do you really need high index lenses?
The higher the prescription, the higher indexshould be lens choices. Glasses tend to get quite thickat high correction, especially some low index (1.50)lenses. At the same time, there is less need forhigh index, if you have a very lowprescription.
Also, is there a big difference between 1.67 and 1.74 high index lenses? And that is the basic difference between 1.67and 1.74 high index lenses: the latter is simplythinner, and lighter, than the former. Lenses with arefraction index of 1.7 or higher are at least 50percent thinner than those with a regularindex.
Also know, at what prescription should you get high index lenses?
High index lenses with 1.70 high index and1.74 are the thinnest lenses on the market, and are madeonly for people with the highest prescriptions. If yourprescription is lower than +/-6.00 sphere, there is no needfor you to spend the extra money for an ultra high indexlens.
What is a high index lens?
A high-index eyeglass lens allowspeople with a stronger prescription to wear a lens that islightweight and thin. This ensures more comfortable glasses even ifyour farsightedness, nearsightedness, or astigmatism prescriptionis high. The lenses are a high-indexplastic material.
Related Question Answers
What is the thinnest lens for high prescriptions?
If you have a very strong prescription, youshould consider ultra thin high index 1.74 lenses.High Index 1.74 lenses are the thinnest,flattest, and most cosmetically appealing lens everdeveloped.Why are high index lenses so expensive?
The index value refers to the efficiency to bendlight. Increase in the index value means the light is betterrefracted, thus requiring thinner lenses than usual. Thehigher the index value , the thinner thelenses . But these lenses are more expensivethan regular plastic or glass lenses.Why are my eyeglass lenses so thick?
The stronger the prescription, the thicker thelens, all else being equal. Farsighted people'slenses get thicker over the eye, and nearsightedpeople's get thicker at the edges, the farther you go fromthe eye. Frame selection/fit. So, higher index materiallenses will also reduce thickness and "Coke bottle"effect.Do thicker lenses make your eyes look bigger?
High positive prescription lenses arethickest at the midpoint and thinner at the edges, which canresult in a "bug-eyed effect." Avoid bigger lenses that willcause more distorted magnification. High negative prescriptionlenses are thin at the midpoint and thicker atthe outer edges.Do high index lenses make your eyes look smaller?
High index lenses won't change the appearance ofyour eyes, that's due to the power of the lenses,which you can't change. High index lenses will be slightlythinner. Compared to very low index materials that we usedto use, high Lenses are thinner.Aspheric lenses maynot magnify your lenses as much.Do high index lenses cause distortion?
In addition to this, hi index lens materials canalso cause a distortion of peripheral vision. Thesetypes of lenses are thinner and lighter than normal, whichmeans the back surface of the lens is placed further awayfrom the natural curve of your eye.Is anti reflective coating worth it?
AR coatings virtually eliminate all reflectionsfrom the front and back surfaces of your lenses. Without bothersomereflections, more light is able to pass through your lenses whichoptimizes your vision. Most people agree thatanti-reflective coatings on their glasses aredefinitely worth the added cost.Do thinner lenses make a difference?
Thinner edges require less lens material,which reduces the overall weight of the lenses. Lensesmade of high-index plastic are lighter than the samelenses made in conventional plastic, so they're morecomfortable to wear.What prescription is legally blind?
Legal blindness is defined as a visual acuityworse than 20/200 even with best possible correction or a visualfield that is less than 20 degrees. As you see, a person with avisual acuity of 20/200 has a prescription of -2.5. You arelegally blind without correction, but you have normal visionwith correction.What's the difference between polycarbonate and high index lenses?
Thinner. Because of their ability to bend light moreefficiently, high-index lenses for nearsightednesshave thinner edges and high-index lenses forfarsightedness have a thinner center than lenses with thesame prescription power that are made of conventional plastic orpolycarbonate material. Lighter.Why do I need high index lenses?
The way high index lenses are made allows them tobend light more efficiently and thus, do not need asmuch material to bend the light as would typical plastic orglass lenses. Owing to their efficiency, high indexlenses allow for thinner and lighter makes of the sameprescription.What is considered bad eyesight prescription?
To have 20/20 uncorrected vision, orvision achieved without glasses or contact lenses, you musthave low "sphere" and "cyl" numbers on your prescription. Onan eyeglass or contact lens prescription a "sphere" with a"plus" value describes hyperopia or farsightedness and a "minus"indicates myopia or nearsightedness.What does Abbe value mean?
The ABBE VALUE is a number given to describe theamount of chromatic aberration of an ophthalmic lens material. Hereis a list of ABBE VALUES. The higher the number, theless amount of aberration. MATERIAL.Should I get anti reflective coating on glasses?
Anti reflective coating offers several clearbenefits that make it well worth the investment for manypeople. Anti reflective coating makes night driving easier.At night, you'll be more likely to notice reflections in yourglasses and how they interfere with yourvision–especially if you're driving.Are thin lenses better?
Thinner edges require less lens material,which reduces the overall weight of the lenses.Lenses made of high-index plastic are lighter than the samelenses made in conventional plastic, so they're morecomfortable to wear.How thick is a 1.74 lens?
1.67 is ideal for power less than -6.00, 1.74index is ideal for power less than -8.00.Do I really need high index lenses?
The higher the prescription, the higher indexshould be lens choices. Glasses tend to get quite thickat high correction, especially some low index (1.50)lenses. At the same time, there is less need forhigh index, if you have a very lowprescription.What is the difference between 1.6 and 1.67 lens?
In a semi rimless the 1.67 will look alittle thinner. Crizal Alize is easier to clean then Crizal butboth are very scratch resistant. Hoya Super Hi Vision and ZeissCarat are also excellent AR coats. In a semi rimless the1.67 will look a little thinner. 
