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Barn owl vision: the science and the numbers

Tyto alba · order Strigiformes · Birds: all the numbers

Their sharpest vision resolves 3.3 cycles per degree, against 63.75 for people in this dataset.[6][7] Both eyes see the same 36° in front of them.[10]

See it on your photoBack to How do barn owls see?
  • 3.3cycles per degree (sharpness)Measured
  • 36°seen by both eyesMeasured

The barn owl (Tyto alba) is a bird in the order Strigiformes. Its eyes belong to the vision type Owl and night bird: rod-dominated eyes built for dim light, with low sharpness. Measured in this species: sharpness, field of view, foveas and night vision. Measured core: measured values on at least 3 of the 6 dials.

This is a simulation built from published eye measurements, not what the animal experiences.

Method: How we know what animals see (the See Like Animals vision engine) · Sources · Last updated . Every value below carries its evidence level and sources; nothing is typed by hand.

What barn owls see: colour receptors

Barn owl colour receptor peaks, 300 to 700 nmBarn owl: 3 receptor peaks at 463, 530, 555 nm; you: 3 at 421.5, 532, 558.4 nm. ultraviolet300400500600700
Barn owl: 463, 530, 555 nmPeople: 421.5, 532, 558.4 nmWavelength in nanometres

What stands out

  • Its sharpest vision resolves 3.3 cycles per degree: the finest stripe pattern it can tell apart from grey.
  • Both eyes see the same 36° in front of it (binocular overlap), where depth is judged best.
  • Activity pattern: nocturnal.

The six dials

Evidence levels: how the tiers work. "Measured" means a value measured in this species; "Estimated" values come from a close relative or an eye-size formula. The last column gives the values for people from the same catalogue.

Vision values for the barn owl (Tyto alba), catalogue-v1
DialValueEvidenceSourcesPeople
ColourColour receptors
3 receptor classes: 463 nm (SWS (blue)), 530 nm (MWS (green)), 555 nm (LWS (long))
receptor set of nearest measured relative Strix aluco (same order Strigiformes)
Group default[1][2]Colour receptors: 3 receptor classes: 421.5 nm (VS/SWS (violet)), 532 nm (MWS (green)), 558.4 nm (LWS (long)) Measured (not re-verified)[1][3][4][5]
SharpnessAcuity
3.3 cycles per degree
median of 3 behavioural rows (method priority rule)
Measured[6][7]Acuity: 63.75 cycles per degree Measured[8][9]
Field of viewBinocular overlap
36°
median of 1 rows (eyes-at-rest rows preferred)
Measured[10]Binocular overlap: 122.5° Measured[11][12]
Total field of view: 200° Measured (not re-verified)[13]
Blind area behind the head: 160° Derived[13]
Eye placement: frontal Derived[11][12]
Total field of view
201°
median species-v1 total field of order Strigiformes: Strix aluco
Group default[14]
Blind area behind the head
159°		Group default[14]
Eye placement
lateral
frontal if binocular overlap >= 60 deg, else lateral
Derived[10]
Sharp zones (foveas)Number of foveas
1
species-v1.csv text: 1 (temporal area/shallow fovea)
Measured (not re-verified)[15]Number of foveas: 1 Measured[16]
Fovea type: fovea Measured[16]
Fovea type
temporal		Measured (not re-verified)[15]
Night visionActivity pattern
nocturnal
mode of 7 rows (of 7 rows): nocturnal
Measured (not re-verified)[17][18][19][20][21][22][23]Activity pattern: diurnal Measured (not re-verified)[17][24][25][1][26][27][28][23]
Pupil shape: vertical Group default[29][30]
Reflective layer (tapetum): no Measured[31]
Rods vs cones: cone-dominated Derived[17][24][25][1][26][27][28][23]
Reflective layer (tapetum)
no		Measured (not re-verified)[32]
Rods vs cones
rod-dominated
nocturnal -> rod-dominated; crepuscular / cathemeral / mixed -> mixed; diurnal -> cone-dominated
Derived[17][18][19][20][21][22][23]
Motion (flicker fusion)Flicker fusion frequency
50 Hz
median of 3 relatives in order Strigiformes: Bubo virginianus, Athene noctua, Asio flammeus
Group default[33][34]Flicker fusion frequency: 60 Hz Measured[33][35]

All birds side by side: Birds: every measurement. Method: how we know what animals see.

Sources

  1. Longcore 2023
  2. VPOD in-vivo (MSP / single-cell) lambda… 2025
  3. Kirwan
  4. Müller et al. 2009
  5. Thermal Activation and Photoactivation of Visual… 2004
  6. Caves et al. 2018
  7. Caves et al. 2024
  8. Kirk et al. 2004
  9. Veilleux et al. 2014
  10. Potier et al. 2023
  11. Heesy 2004
  12. Heffner et al. 1992
  13. Campbell & Green 1965
  14. Martin 1984
  15. Harmening et al. 2009
  16. Kopania et al. 2025
  17. Anderson et al. 2017
  18. Angielczyk et al. 2014
  19. Light conditions and the evolution of…
  20. Choiniere et al. 2021
  21. Wilman et al. 2014
  22. Schmitz et al. 2011
  23. Moura et al. 2024
  24. Borges et al. 2018
  25. Wilman et al. 2014
  26. Maor et al. 2017
  27. Jones et al. 2009
  28. Schmitz et al. 2011
  29. Banks et al. 2015
  30. Cervino et al. 2021
  31. Guareschi et al. 2025
  32. Standard textbook knowledge
  33. Healy et al. 2013
  34. Lafitte et al. 2022
  35. Inger et al. 2014

Every value cites its sources (all sources). Values were extracted from these works and converted (units, medians, derived values); changes are ours, and the listed sources do not endorse this site. Data: catalogue-v1, built 2026-09-29. Accuracy notes: how accurate is this? Method: how we know.