Prescription Issues: Adjusting Your Glasses for Optimal Vision

Prescription lens degree issues?

Hello, doctor.
When I usually go out, I wear glasses that are about 150 degrees less than my actual prescription, but my regular check-ups show a vision of 1.0, so the doctor said I don't need to change my glasses.
I also have a pair of computer glasses that are approximately 200 degrees less, but recently I've noticed that my right eye has been seeing computer text more blurry.
I went to the optical store for an examination and found that my prescription had increased by 75 degrees.
They helped me adjust the prescription for the right eye of my intermediate-distance glasses by 50 degrees.
However, it seems that now the prescription for my right eye is the same as that of my distance glasses, meaning that only my left eye has an adjustable prescription while my right eye only has blue light protection.
Will this affect the accommodation of my right eye? Should I reduce it by about 25 degrees, or will it not have an impact? Additionally, I understand that for intermediate-distance glasses, it is recommended to reduce the prescription by 150 degrees.
Given that my distance glasses are already reduced by 150 degrees, how should I adjust the prescription for my intermediate-distance glasses?

Y, 20~29 year old female. Ask Date: 2022/06/21

Dr. Gao Pilin reply Ophthalmology

Hello, if the prescription for the right eye has increased, it indicates that the glasses are balanced for both eyes.
There should not be any issues as you mentioned.
For reading or intermediate distances, the principle is to see clearly, and there is no need to be overly concerned about the distance prescription.

Reply Date: 2022/06/21

More Info

When it comes to adjusting your glasses for optimal vision, especially in the context of varying prescriptions for different activities, it's essential to understand how your eyes work and how they adapt to different lenses. Based on your description, it seems you are experiencing some confusion regarding your current prescriptions and how they affect your vision, particularly for computer use and distance viewing.

Firstly, it's important to clarify that the prescription for your glasses should ideally match your visual needs for specific tasks. For instance, if you have a prescription that is 150 degrees less for distance viewing, this is typically done to allow for comfortable vision when looking at objects far away. However, when you switch to computer use, which generally requires a different focal length, the prescription should be adjusted accordingly. The common recommendation is to reduce the prescription by about 150 degrees for intermediate or computer use, as this distance is typically closer than what is required for distance vision.

In your case, you mentioned that your right eye's prescription was deepened by 75 degrees for computer use, which seems to have brought it closer to your distance prescription. This could potentially lead to issues with accommodation, which is the eye's ability to adjust focus between different distances. If your right eye now has the same prescription for both distance and intermediate viewing, it may struggle to adjust when you switch between these tasks, leading to visual discomfort or blurriness.

If you are experiencing persistent blurriness or discomfort while using your computer, it might be worth considering a further adjustment to your right eye's prescription. Reducing it by an additional 25 degrees could help create a more comfortable viewing experience, allowing your eye to better accommodate the distance required for computer work. However, this should be done in consultation with an eye care professional who can assess your specific needs and provide tailored advice.

Regarding your question about how to determine the appropriate prescription for your intermediate glasses, the general guideline of reducing the distance prescription by 150 degrees is a good starting point. If your distance glasses are already reduced by 150 degrees, you might consider keeping the same prescription for your intermediate glasses, or slightly adjusting it based on how you feel while using them. It's crucial to ensure that your glasses provide clear vision without straining your eyes.

In summary, the key to optimal vision lies in having the right prescription for the specific tasks you are performing. If you find that your current glasses are not providing the clarity you need, especially for computer work, it may be beneficial to revisit your eye care provider for a comprehensive evaluation and possible adjustments. Regular check-ups and open communication with your optometrist can help ensure that your vision remains sharp and comfortable as your needs change.

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