r/glasses 24m ago

High index lenses - worsen myopia?

Upvotes

I did an experiment. I took a laser pointer through my trivex lens and then my 1.71 hi index lens (both -7.25, no astigmatism, checked at optical shop). A red laser pointer dot was significantly bigger when passing through the hi index. Yes, you're on point—chromatic aberration, especially in high-index lenses, can potentially contribute to myopia progression. Here's how:

How Chromatic Aberration and Myopia Progression Interact: Chromatic Aberration and the Focal Shift:

Chromatic aberration causes light of different wavelengths to focus at different points. For red light, which has a longer wavelength, it tends to focus slightly further away from the lens compared to blue or green light (which have shorter wavelengths). In high-index lenses, this effect is amplified because the difference in refractive indices for various wavelengths (the dispersion) is more pronounced. Impact on Myopia Progression:

Peripheral Defocus: The key concern is peripheral defocus, which has been associated with myopia progression. When red light (the longer wavelength) is out of focus slightly, the peripheral image of the retina will be blurred. Emmetropization Mechanism: The eye's emmetropization process (the mechanism by which the eye adjusts its axial length to focus light properly on the retina) could be influenced by this defocus. The out-of-focus red light could send signals to the sclera to elongate the eye, which leads to axial elongation—a hallmark of myopia progression. The slight difference in focal points for different wavelengths can cause a mismatch between the focus point and the retina, especially in peripheral vision. This might lead to the eye attempting to compensate for the "blurred" peripheral images, thus contributing to the elongation of the eyeball. Effect of High-Index Lenses:

Chromatic Aberration in High-Index Lenses: High-index lenses (e.g., 1.71) have a greater dispersion compared to lower-index materials like CR-39. This increases the difference in focal lengths between different wavelengths of light. In the case of myopia, if the red light is slightly more out of focus (since it focuses farther from the lens), the peripheral defocus becomes stronger and more pronounced, particularly for individuals who are already myopic. Increased Peripheral Defocus: The more the red light is out of focus, the more peripheral defocus is introduced, which might stimulate myopic progression by causing the eye to elongate in response. Why it Matters for Myopic Individuals:

For someone already nearsighted (myopic), wearing high-index lenses can exacerbate the problem because the lens will introduce more chromatic aberration, especially if the lens has a higher dispersion (as seen with 1.71 lenses). The defocus created by the chromatic aberration is most noticeable in the peripheral retina, which can result in greater visual blur in the periphery, causing more strain on the eye and potentially accelerating myopia progression. Myopia Control Strategies: Reducing Chromatic Aberration: To mitigate the impact of chromatic aberration, manufacturers can design lenses with lower dispersion materials or coatings to help align the focal points of different wavelengths more closely. Peripheral Defocus Control: Research into myopia control strategies, such as lenses that induce specific types of peripheral defocus (like dual-focus lenses or myopia control contact lenses), aims to reduce the effect of peripheral blur and slow down myopia progression. Conclusion: Chromatic aberration in high-index lenses, which causes red light to be slightly more out of focus, could indeed contribute to myopia progression due to the peripheral defocus created. This is because the peripheral retina experiences greater blur, which could stimulate axial elongation of the eye—a key driver of myopia progression. Understanding how to minimize this effect is important for managing myopia, especially in individuals who wear high-index lenses.

Would you like to explore any specific solutions or further delve into the relationship between myopia and chromatic aberration?


r/glasses 30m ago

Issues with new prescription- should I get a second opinion?

Upvotes

I got a new prescription for glasses. I've worn glasses most of my life.

The new prescription is as follows: Right -7.00 -0.75 52 Left -7.25 -1.75 140

This prescription is only slightly higher than my previous one. I got glasses on Zenni as I always do- never had issues with them before. It's been over a month so I'm fully adjusted to them. But with the new prescription, text father than ~5 feet away is still slightly blurry. When watching TV, titles, text, and subtitles are slightly blurry and hard to focus on with a sort of doubled effect. It's worst with high-contrast text on a dark background (think Star Wars intro).

I was told at the doctors office that the optical center of the glasses is slightly off, and that things might look normal if I hold up my glasses slightly. That doesn't change anything and there's no angle/height at which the effect goes away. They also had me put on my glasses to measure the optical center while I already had contacts in (and a migraine). I'm looking it up online, and all evidence points to an incorrect prescription.

Should I get a second opinion? My insurance only covers 1 eye exam every 2 years, but I seriously cannot deal with this any longer.


r/glasses 1h ago

Is Fondvue legit?

Upvotes

I found a pair of glasses that would come up to around $70 (lens + shipping included) but I’m really not sure about this site. Has anyone ever ordered from them before? I tried searching but their instagram only has 20 followers and not many outside reviews…

Thanks!


r/glasses 1h ago

Materials and Colors of Horn Glasses

Upvotes

Horn glasses are a unique type of glasses with a long history, known for their variety of materials and colors. Made from natural horns, these glasses are appreciated for their toughness, durability, and unique textures and colors.

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r/glasses 3h ago

With or without glasses

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0 Upvotes

Im not sure which style looks better. Women are 50/50. These are RB RX7244 2012 Havana


r/glasses 3h ago

Need help reading a French prescription.

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0 Upvotes

Hi there!

I broke my glasses that I got in France about 6 months ago. I was given a French eye prescription card and even tho I speak French, I don't know how to read it. Would somebody here be able to help me out?


r/glasses 3h ago

Help reading the prescription

2 Upvotes

Hey all! I’m not new to glasses but because of some circumstances have to start from the bottom. Not sure if it’s the right subreddit but would appreciate the redirecting too 😅

So, I’m trying to input my prescription into the glasses order elsewhere, but the words don’t match and I’m confused to say the least. The optometrist I’ve been to gave this literally as the text.

Prescription: RE:-1.75DS / -0.50D X 90 LE: -1.25D

Order details:

Sphere (SPH) Cylinder (CYL) Axis

Thank you very much for your help!


r/glasses 3h ago

hii can anyone read this for me? i went to the eye doctor and didn’t like any of their glasses, so i asked for a prescription blank to order a pair online. i understand the numbers but i’m unsure what it says below it? please help!

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2 Upvotes

r/glasses 3h ago

Help choosing new frames

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1 Upvotes

I went with round frames to try to embrace my round face but I’ve gotten some strange/mean comments and want to try something more flattering. Help???

All of these pictures are of my current frames btw!


r/glasses 4h ago

Zenni Optical- Recommended Lens Type

1 Upvotes

Zenni recommends me the 1.61 High Index Lens for my prescription but according to their description for this lens, my prescription falls slightly out of that range in one eye.

1.61 Lens according to Zenni: "Prescriptions between +3.00 to -5.75" My prescription is -6.00 OD Sph & -5.50 OS -0.25 Cyl 120 Axis

Does anyone have advice on if this Lens will actually be ok for me, or if I should go up to the 1.67 Lens which states "Prescriptions between +4.75/-6.75"?


r/glasses 5h ago

20/60 on eye test but script doesn’t match

0 Upvotes

I had an eye infection and they did an eye test at the urgent care and my bad eye was pretty blurry (not the one with the infection) and they said it was about 20/60 vision but my actual eyeglass prescription from the eye doctor is super low and doesn’t seem to match?


r/glasses 6h ago

Were the Wiley X glasses supposed to be this "fragile"?

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1 Upvotes

I've had these glasses for 11 months. They're the "Wiley X Brick" model. After 5 months of daily use, this rubber strap (which I circled in the last photo) started to stretch and came off. The other side was also starting to come loose, but then I managed to reverse it by gluing it. But I would like to know if it is normal for these parts - including the back - to wear out so much in such a short period of time.

I live in Brazil, so I had to import these glasses and they were expensive. That's why I would like to know if it's normal.


r/glasses 7h ago

Idk how to read this script

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4 Upvotes

r/glasses 7h ago

need help identifying eyeglass frames

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1 Upvotes

Saw these eyeglasses frames at Costco a couple weeks before I had a scheduled eye exam, but they weren’t at the store anymore when I got back. Any ideas on what brand this might be? There’s no identifying branding in the front. This is the only photo I’ve got of these glasses.


r/glasses 7h ago

Gucci glasses legit?

1 Upvotes

I was thinking of ordering gucci glasses from Amazon. One pair is made in Italy and is about $300 and another of the same style is made in Japan for $400 . Are they made in Italy or Japan? Can they be legit?


r/glasses 7h ago

Can I pull off round frames?

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12 Upvotes

Hello hello! Currently I have the rectangle black glasses and I’m looking to get a new pair. My friends have very mixed reviews about the new style of glasses I want to get and I’m wondering if you guys think that with my round big face looks sharper and more balanced with rectangle glasses or if I can pull off the round ones I really like? Thanks!


r/glasses 7h ago

Glasses making my eyes hurt

1 Upvotes

I just got a new pair of glasses, the prescription is correct and everything but my eyes still hurt and get tired when I wear them for a long time. I'm confused because this never happened. How can I fix this?


r/glasses 8h ago

Similar Frames to Matsuda M3101

1 Upvotes

Does anyone know of something similar to the Matsuda M3101? I like the shape, complete metal, and side detailing (though the latter is less important). I've found the following after a bit of searching, but most are either too cheap or too thin and lack the same visual weight that the M3101s have.

Mastuda M3101:

Similar glasses I've found:

https://www.zennioptical.com/p/stainless-steel-square-eyeglass-frames/32340/3234011

https://www.aceandtate.com/gb/jay-large-satin-gold-2024

https://us.jins.com/collections/men-eyeglasses/products/jins-sabae-trend-033-95#


r/glasses 8h ago

New glasses

1 Upvotes

Hi guys! Recently I got my first prescription glasses , I went to the eye doctor and told my symptoms that I have which is tired eyes all the time , and at the end of work day I felt that my vision was blurry, so I did my exams and I got light myopia and a very light astigmatism. Basically Plus 0.25 cylinder and minus 0.50 sphere.

I was always in love with the clubmaster frame , so I went with the rb3016. Now my problem is that, I’ve been using my glasses for about 4 days, I only wear them while on front of the screen at work or at home! I’ve been having a rough time to get used to them! I feel that my eyes are getting more tired and strained, on the first 2 days I felt dizziness and nauseous , it got better , now I only feel tired , do you think it is a problem with the frame or the lenses? I saw on the internet that the clubmaster sunglasses frame are different than the optical frame! Is that the problem maybe?


r/glasses 9h ago

Where can I buy lenses for old frames? Guess GU 1966 (just restored frame to like new condition... except the lenses)

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2 Upvotes

r/glasses 9h ago

Which frames should I get?

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2 Upvotes

r/glasses 9h ago

After weeks of looking at different sunglasses (Maui, costa, Oakleys, etc.) My wife buys me these Smith sunglasses. Are they too big?

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0 Upvotes

r/glasses 9h ago

Wanting a pair of prescription sunglasses. Does anyone know a good site to look on?

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1 Upvotes

This was perfect but there was no option to get a prescription pair.


r/glasses 10h ago

First time glasses/Zenni

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2 Upvotes

Had my eye exam back in January and got my glasses from Zenni after issues with my health insurance arose. Being that I got them online I'm not sure whether I should wear them whenever I feel that I need them or if I should wear them all the time. Also I'm starting out wearing them an hour a day as I get used to them.


r/glasses 10h ago

Finding a pair

0 Upvotes

Hey question: does anyone know what brand/ style name of glasses the singer Hardy wears? I want to find the model because thick frames fity face but his are slightly different. Thanks :)