As a branch of medicine, ophthalmology in medical technology is the teaching of recognition (diagnosis), treatment (therapy) and prevention (prevention) of diseases of the eye and the surrounding structures. Ophthalmology or ophthalmology in medical technology is the teaching of the construction, function and diseases and dysfunctions of the visual organ, its appendages and the sense of sight and their medical treatment. Basically, however, ophthalmology is a surgical sub-discipline. The most frequently performed intervention in ophthalmology is cataract surgery, the treatment of cataracts, a typical sign of aging in the eyes. Followed by the surgical correction of visual defects (refractive surgery), which is now often done by laser.