Impact of Eye Conditions on Visual Field Testing Accuracy - Ophthalmology

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When it comes to visual field testing, the accuracy of the results can indeed be influenced by various factors, including the conditions of the eyes being tested. In your case, where one eye is covered during the test, it is important to consider how this might affect the results.

Firstly, if you are covering one eye with a tissue and still able to perceive light from the testing equipment, this could potentially lead to inaccurate results. The visual field test is designed to measure the peripheral vision of the eye that is being tested, and any light perception from the covered eye could interfere with the test's ability to accurately assess the visual field of the uncovered eye. Ideally, the covered eye should be completely occluded to prevent any light perception, which could skew the results. Therefore, it is advisable to keep the covered eye closed during the test to ensure the most accurate readings.

Regarding your concern about high myopia (over 1000 degrees) and its impact on the structure of the eye, it is well-established that high myopia can lead to various structural changes in the eye, including elongation of the eyeball and alterations in the retina and optic nerve. These changes can indeed affect the results of visual field tests. In individuals with high myopia, the optic nerve head may exhibit changes that can mimic or complicate the diagnosis of glaucoma. This is particularly relevant for someone like you who already has glaucoma, as the structural changes associated with high myopia can make it challenging to differentiate between glaucomatous damage and changes due to myopia.

Furthermore, the presence of glaucoma itself can lead to specific patterns of visual field loss, which may be exacerbated by the underlying structural changes from high myopia. For instance, glaucoma typically causes peripheral vision loss, and if there are additional retinal or optic nerve changes due to high myopia, this could further complicate the interpretation of visual field tests.

In summary, for the most accurate results during visual field testing, it is best to keep the covered eye completely closed to avoid any light perception that could interfere with the test. Additionally, the structural differences associated with high myopia can indeed affect the accuracy and interpretation of visual field tests, particularly in the context of glaucoma. Regular follow-ups with your ophthalmologist are essential to monitor both your myopia and glaucoma, as they can provide tailored advice and treatment options based on your specific condition. Always consult with your healthcare provider for personalized recommendations and to ensure that your eye health is being adequately managed.