Adult Aged Aged, 80 and over Anesthesia, Local Cost Savings--economics Costs and Cost Analysis Cryosurgery--economics Endotamponade Female Fluorocarbons--administration & dosage Health Care Costs Humans Male Middle Aged Retinal Detachment--economics Retrospective Studies Scleral Buckling--economics Sulfur Hexafluoride--administration & dosage Treatment Outcome United States Visual Acuity Vitrectomy--economics