A gradual shift from vitrectomy in hopeless cases to vitrectomy in less hopeless cases.
D003930:Diabetic Retinopathy / Q000601:surgery; D005128:Eye Diseases / Q000601:surgery; D005131:Eye Injuries / Q000601:surgery; D006801:Humans; D008297:Male; D008875:Middle Aged; D011379:Prognosis; D014822:Vitreous Body / Q000601:surgery*