Full Answer
What does it mean if your glasses are too thick?
The thickness of glasses’ lenses depends on the power of the lens. People who have very thick lenses have rather poor vision, and need a higher power lens to correct it. You should see my glasses — even with the lightweight plastic lenses, my left lens is still fairly thick.
Are your lenses too thick for your prescription?
For a lower prescription, these materials produce relatively thin lenses, but as the prescription rises in strength a standard material lens can become prohibitively thick. Here’s a look at the higher index ratings and their ability to reduce lens thickness:
What does the thickness of glasses lenses depend on?
The thickness of glasses’ lenses depends on the power of the lens. People who have very thick lenses have rather poor vision, and need a higher power lens to correct it.
Why do people with thick eyeglasses wear high power glasses?
People with thick eyeglasses have very high refractive errors.Usually thick eyeglasses bend more light so people whose image point of focus fall very far away from the retina need high power eyeglasses to bring the point of focus on the retina.Modern optometry encourages such people to go for contact lenses for better cosmetic effect
Why are my high index lenses still thick?
Therefore, a stronger prescription tends to result in thicker lenses. Even though high index lenses are naturally thinner than plastic lenses, this same principle applies to them. These lenses may still look thick due to your particular prescription.
Why are my glasses lens thick?
Why are thick glasses lenses so thick? It's a hard truth to swallow, but the stronger your prescription, the thicker your glasses will be. The way in which eyeglasses correct sight is by using curved lenses. Those who are nearsighted have lenses that are thicker at the edge and thinner in the middles.
How can I make my glasses look less thick?
Well, if you already have thick glasses, you unfortunately can't make them thinner. If you want thin lenses, you'll need to order a new pair of prescription glasses with high index lenses. High index lenses have a higher refractive index than regular plastic lenses, making them more efficient at making a prescription.
How much thinner are 1.67 lenses?
35% thinner1.67 High Index Lenses are on average 35% thinner than ordinary CR39 plastic. 1.74 High Index Lenses are on average 50% thinner than ordinary CR39 plastic.
Are 1.67 lenses worth it?
Lenses with a refractive index of 1.6 are ideal for prescriptions where the – value of your SPH prescription is between -2.50 and -4.00. Between -4.00 and -6.00 we'd recommend a lens with a refractive index of 1.67, and any prescriptions over that a lens with a refractive index of 1.74 will be more suitable.
What is the difference between 1.67 and 1.74 lenses?
0:224:251.67 VS. 1.74 High Index Lenses | SportRx - YouTubeYouTubeStart of suggested clipEnd of suggested clipSome prescriptions as they are stronger can make your eye look larger or smaller depending on theMoreSome prescriptions as they are stronger can make your eye look larger or smaller depending on the vision. Type or strength. And the high index lens materials help to minimize this distortion.
Do lenses get thicker with prescription?
Prescription. Prescription This is easy to understand. For the same index, the higher the prescription, the thicker the lens is.
At what prescription do glasses get thick?
The higher that diopter rating creeps, the thicker the lenses grow. Some people require prescriptions as high as +/- 20.00 diopters or more, producing lenses that are extremely thick, heavy, and distortive.
How do I get the thinnest lenses for my prescription?
Lens Material or Lens Index. In general, the higher the index, the thinner the lens. (For example, a 1.61 lens is thinner than a 1.50 lens.) During the checkout process at Zenni, choosing a higher lens index will be the most direct way to ensure you have the thinnest lenses possible.
When should you get 1.67 high index lenses?
1.67 high index lenses are suitable for prescriptions with an: SPH correction of +/- 7.00 and +/- 9.00, and; CYL correction of +/- 3.25 and +/- 4.00.
Is it worth getting thinner lenses?
Thinner lenses will look better. They'll be easier to have the lens edges hidden within the frame of the glasses. They'll look less noticeable when people look at your glasses. And, they'll feel better.
What does 1.67 index lenses mean?
1.67 High Index The 1.67 High-Index lenses are 20% thinner than Polycarbonate and 30% thinner than Standard with the same prescription. For higher prescriptions, this lens material and index works well due to its reduced weight and edge thickness.
What are high index lenses made of?
High index lenses are made with a particular type of plastic that refracts light more effectively than standard index lenses. This usually means th...
Do high index lenses make eyes look smaller?
High index lenses cause less distortion than lower index lenses with the same prescription. If your prescription is high and your lenses are large,...
Why are high index lenses so expensive?
High index lenses are usually more expensive than lower index lenses because they’re made with more costly materials. The benefits of high index le...
Why are my glasses lenses so thick?
If your eye prescription is high, your lenses will need to be cut thicker to correct your vision correctly. Luckily, choosing higher index lenses f...
Do I need high index lenses?
If you have a high eyeglasses prescription, high index lenses are recommended to ensure that your lenses are as thin as possible. As well as lookin...
How thick are polycarbonate lenses?
EyeBuyDirect’s polycarbonate lenses are cut at a 1.59 lens index. We recommend these lenses for medium-strength prescriptions. Polycarbonate lenses...
How thick will my lenses be?
You can select the thickness of your lenses at EyeBuyDirect by choosing a lens index. The stronger your prescription is, the higher the lens index...
Why are my eyeglasses smaller?
High index lenses cause less distortion than lower index lenses with the same prescription. If your prescription is high and your lenses are large , it can result in your eyes looking smaller or larger, depending on whether you are near or farsighted. High index lenses reduce this effect.
What is the difference between thicker and thinner lenses?
The lens thickness you should get depends on your prescription and your lifestyle. Thicker lenses are more affordable, but can only accommodate lower vision correction needs. Thinner lenses are lightweight (and more stylish!) and can accomodate ALL kinds of vision needs, including higher prescriptions!
What is high index lens?
High index lenses are made with a particular type of plastic that refracts light more effectively than standard index lenses. This usually means that they can be cut thinner than other lenses while providing perfect vision correction for stronger prescriptions.
What is lens index?
Lens index is a number that describes how thick or thin your lenses are. The higher a lens' index is, the thinner it becomes. Higher prescriptions require higher index lenses, while lower prescriptions require lower index lenses. Lens Indexes. watch the video.
Can you cut your eyeglasses thicker?
If your eye prescription is high, your lenses will need to be cut thicker to correct your vision correctly . Luckily, choosing higher index lenses for your glasses means they can be thicker and still correct your vision perfectly.
Why do high prescriptions require thick lenses?
This means that high prescriptions typically require thick lenses for proper vision correction.
Why do eyeglasses vary in power?
Eyeglass lenses vary in power to accommodate for various refractive errors. For more serious errors where vision is significantly blurred without eyeglasses, the lenses need to provide stronger correction. There will be a number that corresponds to your vision when you receive your optometrist’s eyeglass prescription.
Why do we need multifocal lenses?
Multifocal lenses have multiple lens powers in the same lens to provide vision correction for both near and farsightedness. As we age, the lens of the eye becomes less flexible, making it difficult to adjust between objects up close and at a distance.
What are the different types of lenses?
Types of lenses include: Polycarbonate: Impact-resistant with built-in UV protection. Trivex: Lightweight, thin, and impact-resistant. High-index plastic: Suitable for stronger prescriptions as they can be made thinner. Aspheric: Can be designed to varying degrees of curvature to provide a thinner, flatter lens.
What are eyeglasses made of?
As technology continually improves, so do eyeglass lenses. Where most eyeglass lenses were made of glass in the past, modern styles are predominantly made of a specialized plastic. Plastic lenses are more durable, lighter, and thinner than previous styles, making them a superior choice for most eyeglasses.
Can you get an eye exam at Urban Optique?
You can source fully comprehensive eye examinations for you and your children at Urban Optique to preserve and protect your vision. Your optometrist will evaluate your health and vision using various tests and diagnostic tools to ensure you are receiving the highest standard of care.
What happens if your glasses are thick?
So, if someone's lenses are thick, they either have a very strong prescription, or insisted on a bad choice of frames for their prescription or how they fit on the face, or cheaped out on material when they had a moderately high prescription or more. Or a combination of the above.
How are light bending glasses determined?
The light-bending ability of eyeglass lenses is determined by the "index of refraction" of the lens material.
What is the difference between 1.74 and 1.61?
The higher the index the thinner the lens will be (so 1.74 index lenses will be thinner than 1.61 index in the same prescription). Some lens designs can be lenticularized (less thickness at the edge for minus prescriptions) If your prescription is + instead of - then your lenses will be thickest in the center.
What is the refractive index of a lens?
In short: the higher the refractive index, the thinner the lens. Conventional plastic lenses have a refractive index of approximately 1.50. For glass, it's 1.52. Any lens material with a refractive index that's higher than that of glass or plastic is considered to be high-index.
What is the index of refraction of a lens?
Lenses with an index of refraction of 1.70 or higher typically are at least 50 percent thinner than conventional plastic lenses. Also, generally speaking, the higher the index, the higher the cost of the lenses. Your eyeglass prescription also determines what kind of high-index material you might want for your lens.
What is the difference between sphere power and minus lens?
sphere power +/-; Plus lens are thicker in the middle, while minus lens are thicker on the perimeter. cylinder power; this is the astigmatism correction and is most often denoted as a minus number. axis of said astigmatism; given as a meridian value between 0–180.
What is the axis of astigmatism?
axis of said astigmatism; given as a meridian value between 0–180. Just like sphere powers, a minus cylinder with an axis of 90 degrees is going to add thickness to the outside in proportion to it’s power. An axis of less than 90 degrees or greater 90 degrees will add thick. Continue Reading.
What is the thickest part of a farsighted prescription?
The edges of a farsighted prescription are the thickest part of the lens…so even a relatively mild prescription can result in lenses that jut out from the frames, distort the look of the eyes, or preclude you from selecting certain types of frames due to the thickness and weight of the lenses.
What is the difference between 1.74 and 1.50 lenses?
Lenses produced from 1.74 material can reduce thickness by up to 45% in comparison to 1.50 lenses. Above the 1.74 index rating, only glass lenses are available, up to an index rating of 1.9. Because of the changeover from glass to plastic, lens thickness is not comparable.
What is diopter lens?
Diopters are the units used to measure refractive errors and the lenses used to correct them. The higher your corrective diopter rating grows the more curve your lens will require to compensate…and more physical material will be required to house those longer, deeper curves.
What is the index of CR39 lenses?
Standard-material lenses – such as CR39 plastic, Trivex, or polycarbonate plastic – fall within the 1.50-1.56 index. For a lower prescription, these materials produce relatively thin lenses, but as the prescription rises in strength a standard material lens can become prohibitively thick.
Is high index lens thinner than low index lens?
However, high index glass lenses can be significantly thinner when compared to low index glass lenses. If the diopter rating on your prescription is high enough to require lenses that are too thick for your wants or needs, consider making the switch to high index lenses.
Do prescription glasses have thick lenses?
Some people consider any lenses that are not completely hidden within a frame to be thick. Others notice thickness only when it reaches the level of “Coke Bottle” glasses. Your prescription, in that a stronger one will produce a thicker lens.
Why align the optical center to the pupillary center?
The idea is to align the optical center to the pupillary center so that we can minimize distortion and optimize the vision. The wider the pupillary distance, the lens will be thinner. The calculation can be a bit tedious but do remember the relationship between pupillary distance and lens thickness.
Do glasses slip down easily?
Light and comfortable. Glasses rest on the nose. Thicker lens is generally heavier. You wouldn’t want a pair of heavy glasses sit on your nose the entire day and leave red mark. Besides, heavier lens can cause the glasses to slip down easily. You’d need to keep pushing it up. This very action can be pretty annoying.
Does the thickness of a prescription lens increase as the frame size gets larger?
Since the lens thickness increases exponentially, as the frame size gets larger, it will utilize the side of the lens, which is also the thicker part. Therefore, for the same prescription and lens index, the larger the frame, the thicker the lens will turn out.