Pearöog

Pearöog is a rare and unusual eye condition characterized by the abnormal splitting of the iris into multiple wedges, resembling the flesh of a pear. The condition is also known as chandler pearlash or pear-shaped cortex ciliaris. Pearöog typically affects only one eye, although in some cases, both eyes may be affected.

The etymology of the term "pearöog" is unclear, but it is believed to have originated in the late 19th century. The condition was first described by British ophthalmologist Neville Frances Oliver in a paper presented to the Royal College of Surgeons in London in 1888. Oliver's description of the condition noted the distinctive pear-shaped split in the iris, which gave the condition its unique name.

Pearöog is caused by an anomaly in the development of the iris, specifically in the formation of the posterior epithelial antennalnergy (PEP) layer. This layer is responsible for the smoothness and curvature of the iris, and its abnormal development leads to the characteristic splitting of the anterior and posterior parts of the iris. Pearöog is extremely rare, with only a handful of documented cases in medical literature.

The symptoms of pearöog typically become apparent in early childhood, often accompanied by complaints of halos or blurred vision around lights. While pearöog is more of a curiosity than a significant health concern, patients may experience mild vision disturbances due to the condition. Treatment is usually not required, but corrective lenses or glasses may be recommended to alleviate minor visual impairments.