Astigmatism: Why Do I See Double Lines? - Ophthalmology

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Astigmatism is a common refractive error that occurs when the cornea, the clear front surface of the eye, is irregularly shaped. Instead of being perfectly round, the cornea may have a more oval shape, which causes light to focus on multiple points in the eye rather than a single point on the retina. This irregularity can lead to distorted or blurred vision, and it is often characterized by seeing double lines or shadows around objects, especially in low-light conditions.

In your case, with left eye astigmatism of -5.00 diopters and right eye astigmatism of -6.00 diopters, it is quite common to experience visual disturbances such as seeing double lines or shadows. This phenomenon is often referred to as "ghosting" or "double vision," and it can be particularly noticeable when looking at the edges of objects or text. The perception of additional lines or shadows can be more pronounced in dim lighting because the pupil dilates, allowing more light to enter the eye, which can exacerbate the effects of astigmatism.

When you mention that you see an extra line or shadow, especially when reading, it is likely due to the way your eyes are processing visual information. The brain attempts to merge the multiple images it receives from each eye, but with astigmatism, this merging can lead to visual distortions. The fact that you do not experience severe double vision when not wearing your glasses suggests that your brain is compensating for the astigmatism to some extent, but the residual effects are still noticeable.

Regarding your prescription, the recommendation from your optometrist to wear glasses with a lower correction (95 degrees) may be based on your specific visual needs and comfort. Some individuals with astigmatism can adapt to lower prescriptions, especially if they are not experiencing significant visual difficulties in their daily activities. However, if you find that the double lines or shadows are bothersome, it may be worth discussing with your eye care professional the possibility of a stronger prescription or different lens options, such as toric lenses specifically designed for astigmatism.

In addition to corrective lenses, there are other strategies to manage astigmatism-related visual disturbances. Regular eye exams are essential to monitor any changes in your vision and ensure that your prescription remains accurate. Additionally, practicing good eye hygiene, such as taking breaks during prolonged reading or screen time, can help reduce visual fatigue and discomfort.

In summary, the double lines you are experiencing are indeed related to your astigmatism. It is a common symptom of this condition, and while it may not significantly impact your daily life, it is important to communicate any concerns with your eye care provider. They can help determine the best course of action to optimize your vision and ensure that your glasses prescription meets your needs effectively.