Why Do My New Glasses Feel Different Even with the Same Prescription?

Q: Why Do My New Glasses Feel Different Even with the Same Prescription?

Hanya： There will naturally be some differences between curved and flat lenses. <br>Additionally, factors such as the frame type, the tilt angle of the frame, the distance between the lenses and the eyes, the distance between the focal points of the two lenses, whether the focal

The new glasses have the same prescription as the old ones, but they cause dizziness when worn?

Doctor, I got a new pair of glasses with a slightly larger frame than my previous ones.
When I wear them, I can only see straight lines clearly; when I look down even a little, everything becomes blurry.
The optical shop said it's a matter of my adaptation ability.
My previous glasses had curved lenses, while the new ones have flat lenses.
They suggested that changing to a smaller frame would help, but even after the change, I still feel an overwhelming sensation.
However, the optical shop insists that the prescription is the same as my old glasses.
I would like to know if the issue lies with the flat lenses or if it's a problem with the shop's technique (for example, if the astigmatism axis is incorrect, as I have about 250 degrees of astigmatism).
Since the prescription is the same as my old glasses, why does it feel completely different when I wear them? The shop keeps attributing it to my adaptation ability.

hanya, 30~39 year old female. Ask Date: 2015/08/30

Dr. Gao Pilin reply Ophthalmology

Hanya: There will naturally be some differences between curved and flat lenses.
Additionally, factors such as the frame type, the tilt angle of the frame, the distance between the lenses and the eyes, the distance between the focal points of the two lenses, whether the focal points align with the pupils, and the axis of astigmatism, all play a role.
If you do not trust the store, you can seek a second opinion elsewhere.
In Taiwan, the ophthalmology department at Puzi Hospital is open Monday to Friday from 8:00 AM to 12:00 PM and Wednesday afternoons from 1:00 PM to 4:30 PM.
We hope to have the opportunity to serve you.
Gao Pilin

Reply Date: 2015/08/30

More Info

When you experience discomfort or a different visual perception with new glasses, even if the prescription is the same as your previous pair, several factors could be contributing to this issue. Let's break down the potential reasons for your experience.

1. Lens Type and Design: You mentioned that your previous glasses had curved lenses while your new ones are flat. This change in lens design can significantly affect how light enters your eyes and how your brain processes that visual information. Curved lenses can provide a wider field of view and may help in reducing distortion, especially for individuals with astigmatism. Flat lenses, on the other hand, can create a different visual experience, particularly if they are not designed to accommodate your specific vision needs.

2. Frame Size and Fit: The size and fit of the glasses can also play a crucial role in how you perceive your surroundings. If the new frames are larger, the optical center of the lenses may not align with your pupils as accurately as your previous pair. This misalignment can lead to visual distortions, especially when looking down or at angles. If the optical center is off, it can cause blurriness or a feeling of "pulling" in your vision.

3. Astigmatism and Axis Alignment: You mentioned having approximately 250 degrees of astigmatism. If the axis of the cylindrical correction for your astigmatism is not aligned correctly in the new lenses, it can lead to significant visual discomfort. Even a slight misalignment can cause blurriness or distortions, particularly in peripheral vision. It is essential that the optical technician accurately measures and places the axis of the cylinder in the lenses.

4. Adaptation Period: It is common for individuals to experience an adaptation period when switching to new glasses, especially if there are changes in lens type or frame size. However, if the discomfort persists beyond a few days or weeks, it may indicate that the glasses are not suitable for your vision needs.

5. Quality of the Lenses: The quality of the lenses themselves can also impact your visual experience. If the new lenses are of lower quality or not manufactured to the same standards as your previous pair, this could lead to visual distortions or discomfort.

6. Consultation with an Eye Care Professional: If you continue to experience issues with your new glasses, it is advisable to return to the optical store and request a thorough examination. Ask them to double-check the prescription, the alignment of the lenses, and the fitting of the frames. If necessary, seek a second opinion from an eye care professional, such as an optometrist or ophthalmologist, who can provide a comprehensive eye exam and ensure that your prescription is accurate.

In conclusion, the discomfort you are experiencing with your new glasses could stem from a combination of factors, including lens design, frame fit, astigmatism alignment, and the quality of the lenses. It is essential to address these issues with the optical store or a qualified eye care professional to ensure that your vision is corrected appropriately and comfortably.

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