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: 2023/12/26

Dr. Gao Pilin reply Ophthalmology


Hello: In theory, 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.
Nonetheless, adjustments to contact lens prescriptions should be made cautiously and are recommended to be done under the guidance of an ophthalmologist.
An 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 individual needs and eye conditions.

Reply Date: 2023/12/26

More Info


When it comes to adjusting your contact lens prescription, especially in the context of existing eye health concerns, it’s essential to approach this matter with caution and informed guidance. Based on your description, you have a history of high myopia (nearsightedness) and mild astigmatism, along with a recent experience of discomfort and elevated eye pressure in your right eye.
Firstly, adjusting the prescription of your contact lenses can be safe and beneficial, provided it is done under the supervision of a qualified eye care professional, such as an optometrist or ophthalmologist. The primary goal of any prescription adjustment is to ensure optimal visual acuity while also maintaining comfort and eye health.
In your case, you mentioned that your current prescription is left eye (LE) -750 and right eye (RE) -850, with the left eye being adjusted to -800. If you are considering changing your prescription to LE -750 and RE -800, it is crucial to understand how these changes might affect your vision and overall eye health.
1. Impact on Vision: Adjusting the prescription can help alleviate discomfort, especially if the current prescription is causing strain or if the eye pressure is a concern. A lower prescription in the right eye may reduce the strain on that eye, potentially leading to a more comfortable experience when reading or using digital devices. However, it’s essential to ensure that the new prescription still provides adequate correction for your vision needs.
2. Eye Health Considerations: Given your history of elevated eye pressure, it’s important to monitor how any changes in prescription affect your symptoms. Elevated eye pressure can be a precursor to conditions such as glaucoma, so any discomfort or changes in vision should be reported to your eye care provider. They may recommend regular check-ups to monitor your eye pressure and overall eye health, especially after making adjustments to your prescription.

3. Consultation with Eye Care Professional: Before making any changes to your contact lens prescription, it is advisable to have a thorough eye examination. Your eye care professional can assess your current eye health, including the condition of your cornea, lens, and retina, and determine the most appropriate prescription for your needs. They can also provide insights into whether the adjustment will help alleviate your discomfort and improve your visual experience.

4. Trial Period: If your eye care provider agrees to the new prescription, they may suggest a trial period with the adjusted lenses. This allows you to assess how your eyes respond to the new prescription and whether it alleviates the discomfort you’ve been experiencing. During this period, keep track of any changes in your vision or eye health and report them to your provider.

5. Long-term Eye Care: Regular eye examinations are crucial, especially for individuals with high myopia and other eye health concerns. These check-ups can help catch any potential issues early and ensure that your prescription remains appropriate as your vision changes over time.

In conclusion, adjusting your contact lens prescription can be a safe and effective way to improve comfort and vision, particularly if you are experiencing discomfort or elevated eye pressure. However, it is essential to do so under the guidance of a qualified eye care professional who can monitor your eye health and ensure that the new prescription meets your visual needs without compromising your overall eye health. Always prioritize communication with your eye care provider regarding any symptoms or concerns you may have, as they are best equipped to provide personalized recommendations based on your unique situation.

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