This is a video from a middle-aged man with myotonic dystrophy type 1, an autosomal dominant multi-systemic disorder that not only affects the muscles, but also causes other problems such as cataracts, arrhythmias and diabetes mellitus. The video shown here is typical of myotonia which can be seen in these patients. The tone is usually…
Ageing is the most common cause of cataracts (Figure 1), but a number of systemic conditions are also associated with development of cataracts, e.g. myotonic dystrophy (Christmas tree cataract, Figure 2), medications (such as anti-psychotics causing stellate cataract) and Wilson’s disease (sunflower cataract). Figure 1. Nuclear sclerosis cataract – this is the most common form…