Nonsurgical Procedures for Keratoconus Management

Table 1

Classification of articles based on the type of intervention and type of studies.

Corrections	Numbers and type of study
	Prospective comparative	Prospective cases series	Retrospective	Case report	Total	Follow-up range
SCLs	4	8	4		16	Two weeks–24 months
RGPCLs	10	7	4	1	22	3 months–25 years
PBCLs	4			5	9	3 weeks–3 years
HCLs	2	1	4		7	1 day–23 months
SsCLs	6	11	12	3	32	1 day–85 months

SCLs: soft contact lenses, RGPCLs: rigid gas permeable contact lenses, PBCLs: piggy back contact lens system, HCLs: hybrid contact lenses, SsCLs: scleral contact lenses.