Some diseases present symptoms so common that they can be confused with other, more common and milder conditions. This is the case with thyroid eye, which may initially manifest symptoms typical of other conditions, such as redness or mild inflammation, but can eventually lead to double vision and acute vision problems. "The full extent of the disease affects 100% of the patient's work and social life," explains Dr. Sabina Luna, an ophthalmologist at Sant Pau Hospital. It is a rare but progressive and debilitating condition that affects five women for every man and is most prevalent in people between the ages of 40 and 60.