Table 1.

Ten most productive countries for research in intraocular lens power calculation formulas

Rank	BC	Number of Records	BC	Percentage (%)
1	USA	884	0.1	16.1
2	China	384	0.11	7.0
3	Japan	229	0.02	4.2
4	Germany	214	0.05	3.9
5	Spain	197	0.04	3.6
6	India	169	0.01	3.1
7	Italy	136	0.01	2.5
8	Australia	114	0.02	2.1
9	Austria	108	0.01	2.0
10	Korea	88	0.01	1.6

Note: BC indicates betweenness centrality.