Choosing the Right Glasses: Distortion in Large Frames

Q: Choosing the Right Glasses: Distortion in Large Frames

Hello Lulu： Due to the prismatic effect at the edges of the lenses, the thicker the peripheral area, the more pronounced the distortion, especially with higher myopia. <br>Larger frames have thicker edges compared to smaller frames, which can lead to more significant distortion.

Oversized glasses?

Hello, Doctor: I currently have a prescription of -3.00 diopters in my left eye and -4.75 diopters in my right eye (with astigmatism of -1.50 and -1.00, respectively).
I recently got a pair of large-frame glasses, and while I can see clearly in the center, I notice some blurriness or distortion when I look at the periphery.
Does this mean that these glasses may not be suitable for me? Should individuals with higher myopia opt for smaller frames, or should the decision be based on whether I experience discomfort or dizziness? (The staff at the optical shop mentioned that it takes time to adjust and that some distortion at the edges is normal, so I'm unsure if these glasses are appropriate for me and whether they could harm my eyes.) (I chose to have aspheric lenses.)

Lulu, 20~29 year old female. Ask Date: 2020/09/03

Dr. Gao Pilin reply Ophthalmology

Hello Lulu: Due to the prismatic effect at the edges of the lenses, the thicker the peripheral area, the more pronounced the distortion, especially with higher myopia.
Larger frames have thicker edges compared to smaller frames, which can lead to more significant distortion.
However, it is best to avoid viewing objects with a squint; incorporating some head movements can help alleviate this issue.
This is something you can adapt to, and it will not harm your eyes.
However, if you still feel uncomfortable, it may be better to choose a smaller frame.

Taiwan E-Hospital, Puzi Hospital, Ophthalmology Department: Monday, Tuesday, Thursday, and Friday from 8:00 AM to 12:00 PM; Wednesday from 2:00 PM to 4:30 PM.
Online responses are for reference only; if necessary, you should visit a medical facility for treatment.
I hope to have the opportunity to serve you.

Gao Pilin

Reply Date: 2020/09/03

More Info

When it comes to choosing the right glasses, particularly for individuals with significant refractive errors like high myopia (nearsightedness), there are several factors to consider, especially when it involves large frames. Your experience of seeing distortion or blurriness at the edges of your vision when wearing large frames is not uncommon, and it can be attributed to several optical principles.

Firstly, the distortion you are experiencing is likely due to the thickness of the lenses in relation to the size of the frame. In larger frames, the lenses tend to be thicker at the edges, especially for higher prescriptions. This can lead to what is known as "prism effect," where light rays are bent differently at the edges of the lens compared to the center. This effect can cause visual distortions, making objects appear warped or unclear when viewed from the periphery.
For individuals with higher degrees of myopia, like your prescription of -3.00 and -4.75, it is often recommended to choose smaller frames. Smaller frames can help minimize the thickness of the lenses and reduce the amount of distortion experienced at the edges. This is because the optical center of the lens, where vision is clearest, is closer to the center of the frame, allowing for a more natural line of sight.

The advice you received from the optical staff about needing time to adjust to new glasses is valid to some extent. Many people experience a period of adaptation when switching to new prescriptions or frame styles. However, if the distortion is significant and causing discomfort, it may indicate that the frame size is not suitable for your prescription. Symptoms like discomfort, dizziness, or persistent blurriness are signs that you may need to reconsider the frame size or lens type.

Regarding the choice of non-spherical lenses, these are designed to provide a thinner profile and reduce distortion for higher prescriptions. However, they can still exhibit edge distortion if the frame is too large. It’s essential to ensure that the lenses are properly fitted to the frame and that the optical center aligns with your pupils. Misalignment can exacerbate distortion and discomfort.

Ultimately, the best way to determine if a pair of glasses is right for you is to consider your comfort and visual clarity. If you find that the large frames are consistently causing issues, it may be worth exploring smaller frames or consulting with your optometrist about alternative lens options. They can provide personalized recommendations based on your specific visual needs and lifestyle.

In summary, while large frames can be stylish, they may not always be the best choice for individuals with significant refractive errors. If you experience distortion or discomfort, it is advisable to consider smaller frames or consult with an eye care professional to ensure that your glasses provide the best possible vision without compromising comfort. Your eye health is paramount, and finding the right eyewear is crucial for maintaining optimal vision and comfort.

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