3.8(top 10%)

2-year impact

4.0(top 10%)

3-year impact

3.9(top 10%)

5-year impact

3.4(top 10%)

10-year impact

17.4K(top 1%)

PR articles

365.5K(top 2%)

PR citations

159(top 2%)

PR h-index

177(top 2%)

h-index

4.2(top 10%)

extended IF

3.6(top 10%)

2-YI (article-only)

8.5(top 20%)

2-YI (review-only)

0.5(top 100%)

2-YI (comm only)

3.7(top 10%)

2-YI (no self-cite.)

18.7K

documents

455.2K

doc citations

British Journal of Ophthalmology 2-year article impact factor — This chart shows the 2-year article impact factor of **British Journal of Ophthalmology** over time and its percentile among journals. Only research articles are counted in both the numerator (citations) and denominator (citable items).

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How is the 2-year article impact calculated?

The 2-year article impact for year X equals the citations received in year X to research articles published in years X-1 and X-2, divided by the number of research articles published in those two years. Unlike the standard 2-year impact, only items classified as research articles are counted in both the numerator and denominator.

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British Journal of Ophthalmology