Adjusting Contact Lens Prescription: Is It Safe for Eye Health? - Ophthalmology

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Contact lens prescription issues?


Hello, doctor.
About a year ago, I had my glasses prescription checked, which was -8.00 for the left eye and -9.00 for the right eye, with mild astigmatism in the left eye.
Currently, my contact lens prescription is -7.50 for the left eye and -8.50 for the right eye.
However, I often feel discomfort due to increased eye pressure in my right eye.
Would it be feasible to adjust my prescription to -7.50 for the left eye and -8.00 for the right eye? Would this affect my reading or my eyes in general? Thank you.

A, 20~29 year old female. Ask Date: 2023/12/21

Dr. Gao Pilin reply Ophthalmology


Hello: Theoretically, adjusting the prescription of contact lenses from -8.50 to -8.00 for the right eye may help reduce discomfort, particularly the sensation of increased intraocular pressure.
However, there may be a slight imbalance between the two eyes initially, but you will gradually adapt, and the eyes and prescription should not be significantly affected.
Nevertheless, adjusting the contact lens prescription should be done cautiously and is recommended to be carried out under the guidance of an ophthalmologist.
The ophthalmologist can assess your eye condition, including determining whether the sensation of increased intraocular pressure is related to the contact lens prescription or if there is genuinely elevated intraocular pressure, and provide the best adjustment recommendations based on your individual needs and eye condition.

Reply Date: 2023/12/21

More Info


When it comes to adjusting contact lens prescriptions, especially in the context of existing eye conditions such as high myopia and potential eye pressure issues, it is crucial to approach this matter with caution and under the guidance of a qualified eye care professional.
Your current prescription indicates that you have significant myopia, with your left eye at -7.50 diopters and your right eye at -8.50 diopters, along with mild astigmatism in the left eye. The concern about increased eye pressure is particularly important, as it can be a sign of underlying issues such as glaucoma or other ocular conditions. Therefore, any changes to your prescription should be made with careful consideration of your overall eye health.

Adjusting your prescription to left -7.50 and right -8.00 could be feasible, but it is essential to understand how this change might affect your vision and comfort. A reduction in the prescription strength for your right eye may lead to a decrease in clarity, especially for tasks that require sharp vision, such as reading or working on a computer. This could also potentially lead to eye strain, headaches, or discomfort, particularly if your eyes are accustomed to a stronger prescription.

Moreover, if you are experiencing discomfort or a sensation of increased pressure in your right eye, it is vital to address this issue with your eye care provider before making any adjustments to your prescription. They may recommend additional tests to assess your intraocular pressure and evaluate the health of your optic nerve. If there are concerns about elevated eye pressure, it may be necessary to explore the underlying causes and consider treatment options before making any changes to your contact lens prescription.

In terms of safety for your eye health, it is generally safe to adjust your prescription as long as it is done under professional supervision. Eye care professionals can provide personalized recommendations based on your specific visual needs and any existing conditions. They can also guide you on the appropriate type of contact lenses that may be more suitable for your eyes, considering factors such as comfort, oxygen permeability, and moisture retention.

If you decide to proceed with the adjustment, it is advisable to monitor how your eyes respond to the new prescription. Pay attention to any changes in vision clarity, comfort levels, and any symptoms such as headaches or eye strain. If you experience any adverse effects, it is crucial to consult your eye care provider promptly.

In conclusion, while adjusting your contact lens prescription can be safe and beneficial, it is essential to prioritize your overall eye health and comfort. Always consult with your eye care professional before making any changes, especially given your history of high myopia and concerns about eye pressure. They can help ensure that your vision remains clear and comfortable while safeguarding your eye health.

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