Visual Disturbances: Why Do I See Ghost Images on White Text? - Ophthalmology

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Visual disturbances, such as seeing ghost images or experiencing flickering when looking at white backgrounds or black text, can be perplexing and concerning. Based on the symptoms you've described, it seems you are experiencing a phenomenon that could be attributed to several factors, including visual fatigue, optical aberrations, or even physiological responses of the eye.

Firstly, the sensation of seeing ghost images or flickering, especially against a bright white background, can often be linked to a condition known as "visual snow" or "afterimages." Afterimages occur when the photoreceptors in the retina (the cells responsible for detecting light) continue to send signals to the brain even after the stimulus has been removed. This can happen when you look at a bright surface for an extended period, causing temporary overstimulation of the retinal cells. When you shift your gaze, you might still perceive a faint outline or shadow of the previously viewed object, which can appear as a ghost image.

Additionally, your description of seeing "transparent letters" or flickering near black text could be related to the optical effects of astigmatism, which you mentioned you have. Astigmatism occurs when the cornea or lens of the eye is irregularly shaped, leading to blurred or distorted vision. This distortion can cause light to scatter in different directions, resulting in visual artifacts like halos or ghosting around objects, particularly in high-contrast situations, such as black text on a white background.

Moreover, visual disturbances can also arise from eye strain, especially if you have been spending long hours focusing on screens or reading. Digital eye strain, or computer vision syndrome, is characterized by symptoms such as blurred vision, dry eyes, and headaches, which can exacerbate the perception of flickering or ghost images. Ensuring that you take regular breaks, practice the 20-20-20 rule (looking at something 20 feet away for 20 seconds every 20 minutes), and maintaining proper lighting can help alleviate these symptoms.

Since you have already undergone multiple eye examinations, including assessments of intraocular pressure and retinal health, and received normal results, it is reassuring that there are no immediate concerns regarding your eye health. However, if your symptoms persist or worsen, it may be beneficial to seek a comprehensive evaluation at a specialized eye clinic or a larger hospital. This could include further tests such as visual field testing or optical coherence tomography (OCT) to rule out any underlying conditions that may not have been detected in previous assessments.

In conclusion, the visual disturbances you are experiencing could be attributed to a combination of factors, including afterimages, astigmatism, and eye strain. While your current examinations indicate normal eye health, continued monitoring of your symptoms and seeking further evaluation if necessary is advisable. Remember to prioritize eye care, including regular check-ups, proper lighting, and breaks during prolonged visual tasks, to maintain optimal eye health and comfort.