John O’Hagan

2.5k total citations · 2 hit papers
48 papers, 1.7k citations indexed

About

John O’Hagan is a scholar working on Ophthalmology, Dermatology and Health, Toxicology and Mutagenesis. According to data from OpenAlex, John O’Hagan has authored 48 papers receiving a total of 1.7k indexed citations (citations by other indexed papers that have themselves been cited), including 15 papers in Ophthalmology, 14 papers in Dermatology and 13 papers in Health, Toxicology and Mutagenesis. Recurrent topics in John O’Hagan's work include Ocular and Laser Science Research (15 papers), Skin Protection and Aging (14 papers) and Climate Change and Health Impacts (8 papers). John O’Hagan is often cited by papers focused on Ocular and Laser Science Research (15 papers), Skin Protection and Aging (14 papers) and Climate Change and Health Impacts (8 papers). John O’Hagan collaborates with scholars based in United Kingdom, United States and Switzerland. John O’Hagan's co-authors include Luke Price, Marina Khazova, Debra J. Skene, Steven W. Lockley, Stuart N. Peirson, Timothy M. Brown, Charles A. Czeisler, George C. Brainard, Robert J. Lucas and David M. Berson and has published in prestigious journals such as Trends in Neurosciences, PLoS Biology and Atmospheric chemistry and physics.

In The Last Decade

John O’Hagan

45 papers receiving 1.6k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Measuring and using light in the melanopsin age

2013 898 citations Robert J. Lucas, Stuart N. Peirson et al. Trends in Neurosciences profile →
Recommendations for daytime, evening, and nighttime indoor light exposure to best support physiology, sleep, and wakefulness in healthy adults

2022 301 citations Timothy M. Brown, George C. Brainard et al. PLoS Biology profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
John O’Hagan United Kingdom	13	836	727	269	249	247	48	1.7k
Luke Price United Kingdom	11	1.1k 1.3×	895 1.2×	339 1.3×	312 1.3×	226 0.9×	25	1.7k
Manuel Spitschan Germany	21	1.1k 1.4×	702 1.0×	156 0.6×	360 1.4×	230 0.9×	84	2.0k
Andrew Bierman United States	25	1.2k 1.4×	1.4k 2.0×	443 1.6×	387 1.6×	206 0.8×	61	2.6k
MG Figueiro United States	18	914 1.1×	1.0k 1.4×	531 2.0×	315 1.3×	251 1.0×	26	1.6k
Edward W. Gerner United States	9	1.4k 1.7×	731 1.0×	188 0.7×	401 1.6×	149 0.6×	9	1.9k
K.C.H.J. Smolders Netherlands	23	701 0.8×	803 1.1×	464 1.7×	518 2.1×	257 1.0×	40	1.7k
Christina Schmidt Belgium	18	684 0.8×	283 0.4×	58 0.2×	521 2.1×	45 0.2×	28	1.5k
Kevin W. Houser United States	26	301 0.4×	731 1.0×	466 1.7×	197 0.8×	197 0.8×	98	2.2k
Raymond P. Najjar Singapore	23	457 0.5×	343 0.5×	16 0.1×	111 0.4×	49 0.2×	67	1.6k
Virginie Gabel Germany	18	350 0.4×	143 0.2×	24 0.1×	304 1.2×	21 0.1×	49	1.1k

Countries citing papers authored by John O’Hagan

Since Specialization

Citations

This map shows the geographic impact of John O’Hagan's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by John O’Hagan with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites John O’Hagan more than expected).

Fields of papers citing papers by John O’Hagan

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by John O’Hagan. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by John O’Hagan. The network helps show where John O’Hagan may publish in the future.

Co-authorship network of co-authors of John O’Hagan

This figure shows the co-authorship network connecting the top 25 collaborators of John O’Hagan. A scholar is included among the top collaborators of John O’Hagan based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with John O’Hagan. John O’Hagan is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

Sort: Min cites: Since: Top N: Style:

20 of 20 papers shown

Brown, Timothy M., George C. Brainard, Christian Cajochen, et al.. (2022). Recommendations for daytime, evening, and nighttime indoor light exposure to best support physiology, sleep, and wakefulness in healthy adults. PLoS Biology. 20(3). e3001571–e3001571. 301 indexed citations breakdown →

Tinker, Rick, Jacques S. Abramowicz, Rüdiger Matthes, et al.. (2021). A coherent framework for non-ionising radiation protection. Journal of Radiological Protection. 42(1). 10501–10501. 4 indexed citations

Khazova, Marina, et al.. (2020). Public Health Implications of Solar UV Exposure during Extreme Cold and Hot Weather Episodes in 2018 in Chilton, South East England. Journal of Environmental and Public Health. 2020. 1–9. 19 indexed citations

Brown, Timothy M., George C. Brainard, Christian Cajochen, et al.. (2020). <strong>Recommendations for Healthy Daytime, Evening, and Night-Time Indoor Light Exposure</strong>. Preprints.org. 32 indexed citations

Hunter, Nezahat, et al.. (2019). Relationship between erythema effective UV radiant exposure, total ozone, cloud cover and aerosols in southern England, UK. Atmospheric chemistry and physics. 19(1). 683–699. 8 indexed citations

Schulmeister, Karl, John O’Hagan, & David H. Sliney. (2019). Lamp and LED safety – classification vs. realistic exposure analysis. 801–801. 1 indexed citations

Hunter, Nezahat, et al.. (2018). Relationship between erythema effective UV radiant exposure, total ozone and cloud cover in southern England UK: 1991–2015. 1 indexed citations

Manners, James, et al.. (2017). Toward a New UV Index Diagnostic in the Met Office's Forecast Model. Journal of Advances in Modeling Earth Systems. 9(7). 2654–2671. 3 indexed citations

Hunter, Nezahat, et al.. (2017). Long term variations in erythema effective solar UV at Chilton, UK, from 1991 to 2015. Photochemical & Photobiological Sciences. 16(11). 1596–1603. 10 indexed citations

10.

O’Hagan, John, Marina Khazova, & Luke Price. (2016). Low-energy light bulbs, computers, tablets and the blue light hazard. Eye. 30(2). 230–233. 130 indexed citations

11.

O’Hagan, John, et al.. (2015). The changes in attitude of students following laser safety training. 247–254.

12.

Raoof, Naz, et al.. (2015). ‘Toy’ laser macular burns in children: 12-month update. Eye. 30(3). 492–496. 17 indexed citations

13.

O’Hagan, John, et al.. (2015). Blue Laser Induced Retinal Injury in a Commercial Pilot at 1300 ft. Aerospace Medicine and Human Performance. 87(1). 69–70. 15 indexed citations

14.

Baczyńska, K, et al.. (2015). Occupational Ocular UV Exposure in Civilian Aircrew. Aerospace Medicine and Human Performance. 87(1). 32–39. 10 indexed citations

15.

Lucas, Robert J., Stuart N. Peirson, David M. Berson, et al.. (2013). Measuring and using light in the melanopsin age. Trends in Neurosciences. 37(1). 1–9. 898 indexed citations breakdown →

16.

Baczyńska, K, et al.. (2011). Temperature Correction of UV Spectral Solar Measurements for ICEPURE Project. Photochemistry and Photobiology. 87(6). 1464–1467. 10 indexed citations

17.

Khazova, Marina, et al.. (2006). Assessment of sun protection for children's summer 2005 clothing collection. Radiation Protection Dosimetry. 123(3). 288–294. 16 indexed citations

18.

Khazova, Marina, et al.. (2006). Radiation and chemical degradation of UVR protection characteristics of fabrics. Radiation Protection Dosimetry. 123(3). 369–377. 5 indexed citations

19.

Sienkiewicz, Zenon, et al.. (1989). Relationship between local temperature and heat transfer through the hand and wrist. Bioelectromagnetics. 10(1). 77–84. 5 indexed citations

20.

McCullough, Scott, et al.. (1988). Infectious agents in respiratory disease of housed, fattening lambs in Northern Ireland. Veterinary Record. 122(9). 203–207. 12 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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