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Hospital / health system · Chennai · India

Sankara Nethralaya

In research, Sankara Nethralaya stands highest in Ophthalmology (#118 of 146 worldwide), Radiology, Nuclear Medicine and Imaging (#508 of 594 worldwide) and Health Sciences (#8,510 of 9,902 worldwide), 2022-now. Relative to its size it is most specialised in Ophthalmology, Radiology, Nuclear Medicine and Imaging and Neurology (Ophthalmology is 119.1× its share of world research).

sankaranethralaya.orgROR OpenAlex
World rank, 2022-now
#17,367
of 22,385 · #21,852 all time
Rank in India
#1,233
of 1,562
Research works
2.5k
▼ 3% vs 2018-21
Citations
31k
12.3 per fractional work
Top-10% rate
3.3%
all institutions 10.0%
vs its own fields
0.65×
1.00× is exactly expected
Open access
60%
world 40%
International
14%
world 18%
Sankara Nethralaya

What is Sankara Nethralaya known for in research?

The fields where it stands highest, 2022-now, ranked among every institution above the floor in each field.

FieldWorld rankWhere that sitsTop-10% rateWorksAll time
OphthalmologySubfield #118 of 146 3.4%206 #375
Radiology, Nuclear Medicine and ImagingSubfield #508 of 594 2.3%83 #866
Health SciencesDomain #8,510 of 9,902 3.0%521 #6127
MedicineField #7,807 of 8,541 2.9%504 #6626
Life SciencesDomain #6,140 of 6,403 2.3%85 #10461

Each strip is that field's whole ranked pool, with the notch where Sankara Nethralaya sits in it, in the colour of the band that rank falls in. The track under the rate is the rate itself: it carries no average mark, because the average differs by field (from about 6% in Dentistry to 21% in Economics).

Which of those standings moved

The same fields on both windows: where it stood over the whole record, and where it stands in 2022-now. The distance is the story, and it is the one thing the two rank columns above cannot show.

  1. Ophthalmology#375 #118
  2. Radiology, Nuclear Medicine and Imaging#866 #508
  3. Health Sciences#6,127 #8,510
  4. Medicine#6,626 #7,807
  5. Life Sciences#10,461 #6,140
all time2022-now, better2022-now, worse

A dot further right is a better standing. Fields it was not ranked in over the whole record are left out.

Which fields of science does Sankara Nethralaya work in?

In 2022-now, 80% of research at Sankara Nethralaya is in Health Sciences, 14% in Life Sciences. Its largest fields are Medicine (78%), Biochemistry, Genetics and Molecular Biology (9%), Immunology and Microbiology (2%). It does 3.4× the world's share of Health Sciences.

Health Sciences: 596 fractional works · 80.1% of its workMedicine: 579 fractional works · 77.7% of its workOphthalmology: 237 fractional works · 31.8% of its workRadiology, Nuclear Medicine and Imaging: 97 fractional works · 13.0% of its workEpidemiology: 41 fractional works · 5.5% of its workPublic Health, Environmental and Occupational Health: 27 fractional works · 3.7% of its workNeurology: 25 fractional works · 3.4% of its workSurgery: 23 fractional works · 3.1% of its workPathology and Forensic Medicine: 18 fractional works · 2.4% of its workRheumatology: 15 fractional works · 2.0% of its workPhysiology: 13 fractional works · 1.8% of its workOncology: 10 fractional works · 1.4% of its workInfectious Diseases: 9 fractional works · 1.2% of its workPulmonary and Respiratory Medicine: 8 fractional works · 1.1% of its workDermatology: 7 fractional works · 1.0% of its workHematology: 6 fractional works · 0.7% of its workPediatrics, Perinatology and Child Health: 5 fractional works · 0.7% of its workEndocrinology, Diabetes and Metabolism: 5 fractional works · 0.6% of its workGenetics: 4 fractional works · 0.6% of its workOtorhinolaryngology: 4 fractional works · 0.5% of its workPharmacology: 4 fractional works · 0.5% of its workPsychiatry and Mental health: 3 fractional works · 0.4% of its workMicrobiology: 2 fractional works · 0.3% of its workNephrology: 2 fractional works · 0.3% of its workCardiology and Cardiovascular Medicine: 2 fractional works · 0.2% of its workObstetrics and Gynecology: 2 fractional works · 0.2% of its workSmaller subfields together: 9 fractional works · 1.2% of its workHealth Professions: 9 fractional works · 1.2% of its workGeneral Health Professions: 3 fractional works · 0.5% of its workHealth Information Management: 3 fractional works · 0.4% of its workSmaller subfields together: 3 fractional works · 0.4% of its workVeterinary: 5 fractional works · 0.7% of its workSmall Animals: 5 fractional works · 0.7% of its workDentistry: 2 fractional works · 0.2% of its workNursing: 2 fractional works · 0.2% of its workNutrition and Dietetics: 2 fractional works · 0.2% of its workLife Sciences: 105 fractional works · 14.1% of its workBiochemistry, Genetics and Molecular Biology: 70 fractional works · 9.3% of its workMolecular Biology: 31 fractional works · 4.1% of its workGenetics: 27 fractional works · 3.6% of its workEndocrinology: 4 fractional works · 0.5% of its workClinical Biochemistry: 2 fractional works · 0.3% of its workCell Biology: 2 fractional works · 0.3% of its workSmaller subfields together: 4 fractional works · 0.5% of its workImmunology and Microbiology: 15 fractional works · 2.0% of its workParasitology: 9 fractional works · 1.2% of its workImmunology: 3 fractional works · 0.4% of its workSmaller subfields together: 3 fractional works · 0.3% of its workNeuroscience: 10 fractional works · 1.3% of its workCognitive Neuroscience: 4 fractional works · 0.5% of its workCellular and Molecular Neuroscience: 2 fractional works · 0.3% of its workNeurology: 1 fractional works · 0.2% of its workSmaller subfields together: 2 fractional works · 0.3% of its workAgricultural and Biological Sciences: 8 fractional works · 1.1% of its workEcology, Evolution, Behavior and Systematics: 3 fractional works · 0.4% of its workSmaller subfields together: 6 fractional works · 0.8% of its workPharmacology, Toxicology and Pharmaceutics: 2 fractional works · 0.3% of its workPhysical Sciences: 24 fractional works · 3.2% of its workEngineering: 8 fractional works · 1.1% of its workBiomedical Engineering: 4 fractional works · 0.5% of its workSmaller subfields together: 5 fractional works · 0.6% of its workEnvironmental Science: 4 fractional works · 0.5% of its workComputer Science: 4 fractional works · 0.5% of its workMaterials Science: 3 fractional works · 0.4% of its workMaterials Chemistry: 2 fractional works · 0.2% of its workSmaller subfields together: 2 fractional works · 0.2% of its workChemistry: 3 fractional works · 0.4% of its workOrganic Chemistry: 2 fractional works · 0.3% of its workSmaller subfields together: 1 fractional works · 0.1% of its workMathematics: 0 fractional works · 0.1% of its workEnergy: 0 fractional works · 0.0% of its workEarth and Planetary Sciences: 0 fractional works · 0.0% of its workPhysics and Astronomy: 0 fractional works · 0.0% of its workSocial Sciences: 20 fractional works · 2.7% of its workPsychology: 8 fractional works · 1.0% of its workSocial Psychology: 3 fractional works · 0.5% of its workClinical Psychology: 3 fractional works · 0.3% of its workSmaller subfields together: 1 fractional works · 0.2% of its workSocial Sciences: 6 fractional works · 0.8% of its workSociology and Political Science: 2 fractional works · 0.3% of its workSmaller subfields together: 4 fractional works · 0.6% of its workArts and Humanities: 3 fractional works · 0.4% of its workPhilosophy: 2 fractional works · 0.2% of its workSmaller subfields together: 1 fractional works · 0.2% of its workDecision Sciences: 1 fractional works · 0.2% of its workEconomics, Econometrics and Finance: 1 fractional works · 0.1% of its workBusiness, Management and Accounting: 1 fractional works · 0.1% of its workALL ITS WORKSankaraNethralaya745fractional works, 2022-now
Life Sciences14%Physical Sciences3%Health Sciences80%Social Sciences3%

Each ring splits the one inside it: the four domains of science, their fields, their subfields. Size is fractional works in 2022-now. Every slice is a page; the interactive view zooms down to single topics and colours each by how much more of it this institution does than the world.

Its 4 domains and 25 fields, with their numbers
    1. Medicine57977.7%
    2. Health Professions91.2%
    3. Veterinary50.7%
    4. Dentistry20.2%
    5. Nursing20.2%
    1. Biochemistry, Genetics and Molecular Biology709.3%
    2. Immunology and Microbiology152.0%
    3. Neuroscience101.3%
    4. Agricultural and Biological Sciences81.1%
    5. Pharmacology, Toxicology and Pharmaceutics20.3%
    1. Engineering81.1%
    2. Environmental Science40.5%
    3. Computer Science40.5%
    4. Materials Science30.4%
    5. Chemistry30.4%
    6. Mathematics00.1%
    7. Energy00.0%
    8. Earth and Planetary Sciences00.0%
    9. Physics and Astronomy00.0%
    1. Psychology81.0%
    2. Social Sciences60.8%
    3. Arts and Humanities30.4%
    4. Decision Sciences10.2%
    5. Economics, Econometrics and Finance10.1%
    6. Business, Management and Accounting10.1%
All of science, and how each field's share has moved since 1950: the Science domain explorer

What does Sankara Nethralaya specialise in?

Where its research is concentrated relative to its size: Ophthalmology takes 119.1× the share of its output that it takes of world research.

  1. OphthalmologySubfield · 236.9 works119×
  2. Radiology, Nuclear Medicine and ImagingSubfield · 97.1 works14×
  3. NeurologySubfield · 25.5 works6.0×
← less than its size predicts1×more →

Location quotient, a volume reading rather than an impact one. It surfaces small, lopsided specialities.

Field profile

Location quotient across every field it publishes in: outside the ring is more than an institution of this size would be expected to publish, inside it is less.

Agricultural and Biological Sciences: 0.24× its world share, 8 worksAgricultural and Bio…Biochemistry, Genetics and Molecular Biology: 1.75× its world share, 70 worksBiochemistry, Geneti…Immunology and Microbiology: 1.96× its world share, 15 worksImmunology and Micro…Neuroscience: 0.81× its world share, 10 worksNeurosciencePharmacology, Toxicology and Pharmaceutics: 0.84× its world share, 2 worksPharmacology, Toxico…Chemistry: 0.26× its world share, 3 worksChemistryComputer Science: 0.07× its world share, 4 worksComputer ScienceEarth and Planetary Sciences: 0.02× its world share, 0 worksEarth and Planetary …Energy: 0.05× its world share, 0 worksEnergyEngineering: 0.08× its world share, 8 worksEngineeringEnvironmental Science: 0.11× its world share, 4 worksEnvironmental ScienceMaterials Science: 0.13× its world share, 3 worksMaterials ScienceMathematics: 0.05× its world share, 0 worksMathematicsPhysics and Astronomy: 0.01× its world share, 0 worksPhysics and AstronomyDentistry: 0.44× its world share, 2 worksDentistryHealth Professions: 0.47× its world share, 9 worksHealth ProfessionsMedicine: 4.04× its world share, 579 worksMedicineNursing: 0.41× its world share, 2 worksNursingVeterinary: 5.24× its world share, 5 worksVeterinaryArts and Humanities: 0.14× its world share, 3 worksArts and HumanitiesBusiness, Management and Accounting: 0.04× its world share, 1 worksBusiness, Management…Decision Sciences: 0.19× its world share, 1 worksDecision SciencesEconomics, Econometrics and Finance: 0.07× its world share, 1 worksEconomics, Econometr…Psychology: 0.33× its world share, 8 worksPsychologySocial Sciences: 0.07× its world share, 6 worksSocial Sciences1×world share
more than its size predictsabout as predictedless

Rings at 0.5×, 1× and 2×. Widest outward: Veterinary, 5.2×. Every wedge is a field page.

All 25 fields, with their numbers
  1. Veterinary5.24×5 works
  2. Medicine4.04×579 works
  3. Immunology and Microbiology1.96×15 works
  4. Biochemistry, Genetics and Molecular Biology1.75×70 works
  5. Pharmacology, Toxicology and Pharmaceutics0.84×2 works
  6. Neuroscience0.81×10 works
  7. Health Professions0.47×9 works
  8. Dentistry0.44×2 works
  9. Nursing0.41×2 works
  10. Psychology0.33×8 works
  11. Chemistry0.26×3 works
  12. Agricultural and Biological Sciences0.24×8 works
  13. Decision Sciences0.19×1 works
  14. Arts and Humanities0.14×3 works
  15. Materials Science0.13×3 works
  16. Environmental Science0.11×4 works
  17. Engineering0.08×8 works
  18. Computer Science0.07×4 works
  19. Economics, Econometrics and Finance0.07×1 works
  20. Social Sciences0.07×6 works
  21. Energy0.05×0 works
  22. Mathematics0.05×0 works
  23. Business, Management and Accounting0.04×1 works
  24. Earth and Planetary Sciences0.02×0 works
  25. Physics and Astronomy0.01×0 works

Who are the top researchers at Sankara Nethralaya?

Ranked on the quality score, Rajiv Raman, Mamta Agarwal and Ronnie Jacob George lead among researchers whose main affiliation is Sankara Nethralaya.

  1. 1 Rajiv Raman India · #453,580 worldwide 16k citations · 342 works
  2. 2 Mamta Agarwal India · #489,962 worldwide 2.7k citations · 40 works
  3. 3 Ronnie Jacob George India · #696,919 worldwide 24k citations · 284 works
  4. 4 Lingam Vijaya India · #737,820 worldwide 5.4k citations · 162 works
  5. 5 Janani Surya India · #1,139,224 worldwide 484 citations · 47 works
  6. 6 Lingam Gopal India · #1,166,325 worldwide 2.8k citations · 177 works
  7. 7 Suganeswari Ganesan India · #1,377,626 worldwide 1.2k citations · 69 works
  8. 8 Vaitheeswaran Kulothungan India · #1,490,345 worldwide 1.5k citations · 42 works
  9. 9 Vikas Khetan India · #1,648,856 worldwide 3.8k citations · 224 works
  10. 10 Ambika Selvakumar India · #1,727,949 worldwide 813 citations · 99 works
All ranked researchers at Sankara Nethralaya

What are the most cited papers from Sankara Nethralaya?

The most cited paper from Sankara Nethralaya is "Development and Validation of a Deep Learning Algorithm for Detection of Diabetic Retinopathy in Retinal Fundus Photographs" (Varun Gulshan, Lily Peng, Marc Coram et al., 2016), with 7,873 citations. Next come "Global Prevalence and Major Risk Factors of Diabetic Retinopathy" (5,033) and "Causes of blindness and vision impairment in 2020 and trends over 30 years, and prevalence of avoidable blindness in relation to VISION 2020: the Right to Sight: an analysis for the Global Burden of Disease Study" (3,188).

Most cited papers
#PaperReleasedCitations
1 Development and Validation of a Deep Learning Algorithm for Detection of Diabetic Retinopathy in Retinal Fundus Photographs Varun Gulshan, Lily Peng, Marc Coram et al. · JAMA 29 Nov 2016 7,873
2 Global Prevalence and Major Risk Factors of Diabetic Retinopathy Joanne Wen Yee Yau et al. · Diabetes Care Open access 2 Feb 2012 5,033
3 Causes of blindness and vision impairment in 2020 and trends over 30 years, and prevalence of avoidable blindness in relation to VISION 2020: the Right to Sight: an analysis for the Global Burden of Disease Study Jaimie D Steinmetz et al. · The Lancet Global Health Open access243 authors Dec 2020 3,188
4 Trends in prevalence of blindness and distance and near vision impairment over 30 years: an analysis for the Global Burden of Disease Study Rupert Bourne et al. · The Lancet Global Health Open access164 authors Dec 2020 1,432
5 Artificial Intelligence and Deep Learning in Ophthalmology Daniel Shu Wei Ting, Louis R. Pasquale, Lily Peng et al. · Artificial Intelligence in Medicine Book chapterOpen access 25 Oct 2018 1,231
All 60 most cited papers, with filters and sorting

Which keywords describe research at Sankara Nethralaya?

By fractional works in 2022-now, weighted toward what it does more of than the world: Epidemiology, Glaucoma, Intravitreal Injection, Optical Coherence Tomography, Intraocular Pressure, Macular Degeneration, Juvenile Idiopathic Arthritis and Immunosuppressive Therapy.

▲ more of its work than of the world's◆ about the world's share▼ less than the world's

Size is fractional works in 2022-now in the topics tagged with each word; colour is the word's share of this institution's work against its share of the world's. The 40 words are chosen for being large and distinctive. Each links to the topic it comes from most.

All 40 words, with their numbers
  1. Epidemiology142▲ 4.8×61 topics
  2. Glaucoma70▲ 63×4 topics
  3. Intravitreal Injection59▲ 109×2 topics
  4. Optical Coherence Tomography58▲ 78×3 topics
  5. Intraocular Pressure58▲ 88×2 topics
  6. Macular Degeneration58▲ 63×3 topics
  7. Juvenile Idiopathic Arthritis51▲ 133×2 topics
  8. Immunosuppressive Therapy50▲ 35×3 topics
  9. Behçet's Disease49▲ 233×1 topic
  10. Diabetic Retinopathy49▲ 65×2 topics
  11. Uveitis49▲ 233×1 topic
  12. Inflammation46▲ 2.9×30 topics
  13. Myopia44▲ 89×2 topics
  14. Genetic Mutations44▲ 14×15 topics
  15. Oxidative Stress43▲ 3.5×25 topics
  16. Optic Nerve42▲ 58×2 topics
  17. Vascular Endothelial Growth Factor40▲ 61×4 topics
  18. Endophthalmitis35▲ 128×2 topics
  19. Antibiotic Resistance34▲ 12×12 topics
  20. Choroidal Thickness34▲ 84×1 topic
  21. Retinal Pigment Epithelium34▲ 84×1 topic
  22. ACE2 Receptor32▲ 19×3 topics
  23. Corneal Biomechanics31▲ 112×1 topic
  24. Keratoconus31▲ 112×1 topic
  25. Ocular Findings30▲ 146×1 topic
  26. Retinal Artery Occlusion30▲ 146×1 topic
  27. Prognostic Factors29▲ 9.1×9 topics
  28. Neurodegeneration28▲ 12×5 topics
  29. Femtosecond Laser28▲ 71×1 topic
  30. Intraocular Lens Implantation28▲ 124×1 topic
  31. Retinal Ganglion Cells28▲ 34×3 topics
  32. Ocular Hypertension27▲ 71×1 topic
  33. Visual Field Progression27▲ 71×1 topic
  34. OCT Imaging26▲ 120×2 topics
  35. Keratitis25▲ 184×1 topic
  36. Ocular Infections25▲ 184×1 topic
  37. Inflammatory Cytokines24▲ 36×2 topics
  38. Wound Healing23▲ 12×5 topics
  39. Dry Eye Disease23▲ 92×1 topic
  40. Ocular Surface23▲ 92×1 topic

Which research topics does Sankara Nethralaya publish most on?

By volume in 2022-now: Ocular Diseases and Behçet’s Syndrome, Retinal Diseases and Treatments, Corneal surgery and disorders and Retinal and Optic Conditions.

Ocular Diseases and Behç…49Ocular Diseases and Behçet’s Syndrome: 49 fractional worksRetinal Diseases and Tre…34Retinal Diseases and Treatments: 34 fractional worksCorneal surgery and disorders: 31 fractional worksRetinal and Optic Conditions: 30 fractional worksIntraocular Surgery and Lenses: 28 fractional worksGlaucoma and retinal disorders: 27 fractional worksOcular Infections and Treatments: 25 fractional worksOcular Surface and Conta…23Ocular Surface and Contact Lens: 23 fractional worksRetinal and Macular Surgery: 22 fractional worksOphthalmology and Visual Impairment Studies: 22 fractional works
OphthalmologyRadiology, Nuclear Medicine and ImagingPublic Health, Environmental and Occupational HealthEpidemiology

Area is fractional works; colour is the subfield each topic belongs to.

  1. 1 Ocular Diseases and Behçet’s Syndrome Ophthalmology 49 works
  2. 2 Retinal Diseases and Treatments Ophthalmology 34 works
  3. 3 Corneal surgery and disorders Radiology, Nuclear Medicine and Imaging 31 works
  4. 4 Retinal and Optic Conditions Ophthalmology 30 works
  5. 5 Intraocular Surgery and Lenses Ophthalmology 28 works
  6. 6 Glaucoma and retinal disorders Ophthalmology 27 works
  7. 7 Ocular Infections and Treatments Ophthalmology 25 works
  8. 8 Ocular Surface and Contact Lens Public Health, Environmental and Occupational Health 23 works
  9. 9 Retinal and Macular Surgery Radiology, Nuclear Medicine and Imaging 22 works
  10. 10 Ophthalmology and Visual Impairment Studies Epidemiology 22 works

How open and international is its research?

Against the world's own shares: the tick on each track. Both are shares of its output, so they sit on one scale and can be read against each other as well as against the world.

openly available60.2%not open39.8%

World: 40% of research is openly available.

with international co-authors13.5%domestic only86.5%

World: 18% is written across borders.

How has Sankara Nethralaya's research output changed?

Output in 2022-2025 was 3% lower than in 2018-2021.

still counting1990200020102020
grewheldshrank

The same series as a ribbon: one cell per year, darker for more. The line above answers how much; this answers when.

Its share of all research

Growing output can still be a shrinking share: all of science grows. This is Sankara Nethralaya as a percentage of every work published that year, 0.0030% in 2024.

still counting0.0020%0.0040%Sankara Nethralaya0.0026% in 202519801990200020102020

Fractional works of Sankara Nethralaya over all fractional works that year. How the balance of science has shifted.

How much of it reaches the world top 10%

Year by year, against all institutions in the same year.

still counting5%10%15%all institutions10.0% in 2025Sankara Nethralaya2.3% in 202520102020

Of each year's output, the share that reached the world's 10% most cited for its field and year. Peak 10.4% in 2006.

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