Vision Loss: Insights on High Myopia and Possible Glaucoma - Ophthalmology

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Deterioration of vision?


Hello Dr.
Tsai, I am a patient with high myopia, with approximately 800 degrees in both eyes.
A few years ago, during an examination, I discovered an issue with optic nerve cupping, raising suspicion of glaucoma.
Therefore, I began regular check-ups at a major hospital (including visual field tests and optical coherence tomography), but there have been no significant changes, so glaucoma has not been definitively diagnosed.
In November of last year, I underwent another optical coherence tomography, which also showed no significant changes.
Recently, during a routine retinal examination at a clinic, I noticed a significant decline in my vision prior to the check-up.
Even after the technician corrected my prescription, my vision was only maintained at 0.6 in both eyes (the last check-up in August revealed that only my left eye had deteriorated to 0.8, which was due to an incident where a cat stepped on my eye; however, there were no other abnormalities).
The doctor examined me and found my retina and macula to be normal, suggesting that the optic nerve issue might be causing visual field loss (though he did not state this explicitly, it may be related to glaucoma) or it could be due to eye fatigue.
I would like to ask Dr.
Tsai, since I had an optical coherence tomography in November, is it possible for the optic nerve to change in such a short period (three months)? Or could there be other reasons? I have scheduled another optical coherence tomography and visual field test for the end of March this year; will delaying until then cause further deterioration of my eyes? I have searched online for related symptoms; could they be related to optic nerve atrophy or inflammation? (But can a standard fundus examination determine this?) Thank you very much for your assistance, I greatly appreciate it.

Ms. Chen, 30~39 year old female. Ask Date: 2019/01/22

Dr. Cai Wenyuan reply Ophthalmology


Hello: If there are any changes, please seek medical examination as soon as possible.
Wishing you safety and health.
Sincerely, Dr.
Tsai Wen-Yuan, Director of the Department of Ophthalmology, Taoyuan General Hospital, Ministry of Health and Welfare.

Reply Date: 2019/01/22

More Info


Hello, thank you for your detailed inquiry regarding your vision concerns related to high myopia and potential glaucoma. Given your history of high myopia (over 800 degrees) and previous findings of optic nerve cupping, it’s understandable that you are feeling anxious about your vision and the possibility of glaucoma.

High myopia is a condition where the eyeball is elongated, which can lead to various complications, including retinal detachment, macular degeneration, and glaucoma. The optic nerve cupping you mentioned is a significant finding, as it can indicate increased intraocular pressure (IOP) and potential glaucoma, even if your recent tests have not shown definitive signs of the disease. Regular monitoring is crucial, especially since glaucoma can progress without noticeable symptoms until significant damage has occurred.

Regarding your question about whether changes in the optic nerve can occur within a short period, such as three months, the answer is yes. While it is less common for significant changes to occur so rapidly, fluctuations in intraocular pressure can lead to changes in the optic nerve head and visual field. If your IOP has been elevated at any point, even temporarily, it could potentially contribute to optic nerve damage. Additionally, other factors such as eye fatigue, stress, or even systemic health issues can impact your vision and contribute to perceived changes in visual acuity.

It’s also worth noting that visual acuity can be affected by various factors, including the quality of your corrective lenses, eye strain, and overall eye health. If you are experiencing significant visual changes, it is essential to address these with your eye care provider promptly. They may recommend additional tests, such as visual field testing or optical coherence tomography (OCT), to assess the health of your optic nerve and retina more thoroughly.

As for your concerns about potential optic nerve atrophy or inflammation, these conditions can sometimes be detected during a comprehensive eye exam, including a dilated fundus examination. However, specific imaging tests like OCT can provide more detailed information about the structure of the optic nerve and any potential damage.

In terms of your upcoming appointment in March, it is advisable not to delay your follow-up if you notice any worsening of your symptoms. If you experience sudden changes in vision, such as flashes of light, significant blurriness, or loss of peripheral vision, you should seek immediate medical attention. Early detection and intervention are key in managing conditions like glaucoma and preventing further vision loss.

In summary, your situation requires careful monitoring and possibly more frequent check-ups given your high myopia and the findings related to your optic nerve. It’s crucial to maintain open communication with your eye care provider and report any changes in your vision as soon as they occur. Regular follow-ups will help ensure that any potential issues are addressed promptly, minimizing the risk of significant vision loss. Thank you for reaching out, and I hope this information helps clarify your concerns.

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