However, vision loss is rare, and prompt diagnosis and treatment can prevent this. If the optic nerve is compressed, signals from the eye to the brain are affected, which can lead to vision loss. If the eyelid cannot close to protect the cornea at the front of the eye, it can become more susceptible to infections and ulcers that can cause pain and vision loss. In rare cases, there can be other complications. Eye pain and aching behind the eye, especially if there is an infection or tumour.Red, irritated, and dry eyes due to the cornea being less well protected.In more severe cases, changes can include blurred vision and trouble with seeing colours clearly. Vision problems such as double vision, when swelling restricts movement of the eye muscles.This condition is visible to the naked eye and can give the affected individual a startled or surprised appearance. There can often be other symptoms as well as the change in appearance, including: Exophthalmos, often referred to as proptosis, is a medical term for an abnormal protrusion or bulging of one or both eyeballs. Bulging in both eyes is more likely when there’s an underlying illness such as thyroid eye disease. For example, bulging in one eye can result from a tumour or infection. Symptoms can vary according to the cause. Bulging eyes can develop gradually or suddenly, depending on the cause. The white of the eye may be visible without lifting the eyelid. The most obvious eye sign is one or both eyeballs protruding more than normal, sometimes giving the eyes a startled appearance. Other less common causes include tumours, infection and eye injury. Bulging eyes happen due to an underlying eye problem or health condition, most often thyroid eye disease. Bulging eyes differ from naturally protruding eyes, and as well as appearing to bulge out can cause symptoms including redness, dryness, and vision problems. Exophthalmos and proptosis are both medical names for bulging eyes.
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