Is Adding 25 Degrees to Astigmatism Prescription Safe and Effective? - Ophthalmology

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When it comes to astigmatism prescriptions, the adjustment of lens power is a critical aspect of ensuring optimal vision correction. In your case, the decision to add 25 degrees (or diopters) to your astigmatism prescription raises several important considerations regarding safety and effectiveness.

Astigmatism is a common refractive error caused by an irregular shape of the cornea or lens, leading to blurred or distorted vision. The degree of astigmatism is measured in diopters, and it is crucial to have an accurate prescription tailored to your specific visual needs. The addition of 25 degrees to your existing prescription is significant and should be approached with caution.

Firstly, it is essential to understand that adding power to a prescription is not a standard practice unless specifically indicated by an eye care professional. The rationale behind the adjustment made by the optical shop may be to enhance your vision in low-light conditions, such as night driving. However, this approach can lead to overcorrection, resulting in visual discomfort, fatigue, and difficulty focusing, as you have experienced.

The symptoms you describe—eye fatigue and difficulty refocusing between distant and near objects—are common signs of an incorrect prescription. When the lens power is not aligned with your actual visual needs, it can cause strain on the eye muscles, leading to discomfort and potential headaches. This is especially true when the added power is not warranted by your actual astigmatism measurements.

Moreover, there is a concern regarding the long-term effects of wearing glasses with an incorrect prescription. While wearing an overcorrected lens will not permanently worsen your astigmatism, it can lead to visual discomfort and may cause you to strain your eyes more than necessary. This strain can contribute to symptoms such as dry eyes, headaches, and even temporary blurred vision.

In terms of safety, wearing glasses that do not match your prescription can lead to accidents, particularly when driving at night. If your vision is compromised, your ability to judge distances and react quickly to changing conditions can be impaired, which poses a risk to your safety and that of others on the road.

Given your concerns and the symptoms you are experiencing, it is advisable to consult with a qualified eye care professional, such as an optometrist or ophthalmologist. They can perform a comprehensive eye examination to determine your precise prescription needs and assess whether the added power is appropriate. If necessary, they can provide you with a corrected prescription that alleviates your symptoms and enhances your visual comfort.

In conclusion, while the intention behind adding 25 degrees to your astigmatism prescription may have been to improve your night vision, it is crucial to ensure that any adjustments to your prescription are made based on a thorough understanding of your individual visual needs. Wearing glasses that do not accurately reflect your prescription can lead to discomfort and potential safety issues. Therefore, seeking professional guidance is the best course of action to ensure your eye health and visual clarity.