Table 4.

Other types of keratoprosthesis for repeat corneal transplantation: non-randomized study characteristics and outcomes

Study	Study design	Study dates	Country	Follow-up	Number of participants	Number with repeat PK	Funding source and declarations of interest
Ghaffariyeh 2011	Retrospective case series of the Fyodorov-Zuev KPro	2003-2007	Iran (Dr. Khodadoust Eye Hospital)	Mean 52 months (range 28 to 84 months)	10 (10 eyes)	10/10 (100%)	“None of the authors have any financial or proprietary interest in any material or method mentioned.”
Hille 2006	Retrospective case series the OOKP	1993-2004	Germany (University of Saarland)	Median 2.9 years	25 (25 eyes)	18/25 (72%)	NR

Study	Number with BCVA ≥ 20/100			Other visual acuity outcomes	Number of graft failures			Number of device extrusions
	1 year	2 years	5 years		1 year	2 years	5 years
Ghaffariyeh 2011	8/10	8/10	2/4	“Patients retained BUVA of 20/200-20/50 in 50%, 20/60-20/100 in 30%, 20/200 in 10% and 20/400 in 10% of cases. Overall, 90% had 1 year postoperative vision of 20/200 or better. Eyes had 20/200 or better in 70% of cases at the last follow-up (average 52 months).”	1/10 (10%)	2/10 (20%)	3/10 (30%) at 3 years; failure rate 30% during follow-up	3/10 (30%) during follow-up
Hille 2006	11/20 (55%)	7/14 (50%)	2/5 (40%)	79% achieved ambulatory vision of 20/400 at last follow up	NR	NR	NR	None reported

BCVA: best-corrected visual acuity

BUVA: best-uncorrected visual acuity

OOKP: osteo-odonto-keratoprosthesis

NR: not reported

PK: penetrating keratoplasty