Because of their ability to bend light more efficientlyhigh index lenses for nearsightedness have thinner edges and high index lenses for farsightedness have a thinner center than lenses with the same prescription power that are made of conventional plastic or polycarbonate material.
Plastic CR lenses have a refractive index of and Polycarbonate lenses have an index of refraction of .Any lens material that has a refractive index higher than glass (.) is considered a high index material.
High index plastic lenses can Winning the High Index Numbers Game a patient who cannot tolerate a polycarbonate material or a high index can still be given a
Do You Need High Index Lenses The index question comes upevery so often in my e mail and sometimes in the forumAlso consider that polycarbonate is much more
Lens Materials CR vsPolycarbonateon clarity as required with polycarbonateHigh index plastics can approximate lightweight plasticpolycarbonate UV.
High index lenses are an alternative choice to standardplastic eyeglass lensesAlthough high index lenses are more expensive than plastic lenses they can reduce the thickness and weight of an
High index plastic lenses are slim and sleekproviding an alternative option for strong prescriptionsHigh index lenses are typically more expensive than standard plastic and mid index varieties but offer a wider choice of frames for people with stronger prescriptions since the lenses are not bulky.
polycarbonate vshigh index A co worker with the prescription below ordered polycarbonate lenses while others argued that the or high index lenses would have been a noticeably better choice.
Polycarbonate vsTrivex lenses Any lens material with a refractive index that s higher than that of glass or plastic is considered to be high indexHigh index
discuss and doubt that high index plastic will make any differenceI am not an eye doctor so thus cannot tell you why you re having problemsjust that it s not inherent in the polycarbonate material with
Weighing the Options High Index vsAspheric One major exception is polycarbonatea lighter high index material than all other plastic substrates.
They can be made with CRpolycarbonate or high index lensesTrivex lenses Anti scratchgenerally a good idea for allcomes with percent of plastic lensesCheck the warranty
If you have a high prescriptionyou may be wondering about the difference between a high index lens vs aspheric lens vs polycarbonate.
Trivex lenses vs polycarbonate Are polycarbonate lenses helpful YesThese are high index eyeglass lense materials which allow a thinner eyeglass and for a given power of lensare lighter than glass or ordinary plastics.
Polycarbonate and Trivex lenses are much more impact resistant than regular glass and plastic lenses (including other high index lenses) because these lightweight lens materials are relatively soft which means they can absorb energy without lens fracturing.
The optic shop says to buy polycarbonate high indexbut since my eyesight improves a lot with your program I wonder if they are worth the extra moneyWhat do you think This is a fairly common question so lets look at it here briefly.
High index plastic lenses High index plastic is a term used to describe a variety of plastic lens materials that are thinner and lighter than regular CR plasticFor a given prescription power and lens designthe factor that determines lens thickness is the index of refraction (also called refractive index) of the lens material.