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Explore anatomy. Understand the eye.

Whole eye → structures → tissue layers → function

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From understanding anatomy to clinical practice

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What this covers, and its sources

Corneal layers; retinal layers with the two blood supplies; the anterior chamber angle and the gonioscopy landmark order; the lids and lacrimal system; the six extraocular muscles, their actions and the diagnostic positions of gaze; the cranial nerves of the eye through the cavernous sinus and superior orbital fissure; the light reflex and the three-neuron sympathetic chain. Mechanism cards: aqueous dynamics with Goldmann's equation, the tear film, phototransduction and the retinoid cycle, accommodation, the light reflex and anisocoria, yoke muscles and Hering's law, corneal healing and sensation.

Switch between detailed 3D models, the Human Atlas eye and orbit specimen, and approved synthetic teaching illustrations. Assessment uses separate unlabelled schematics. Each representation carries its own sources and limitations; these are educational views, not measurements or patient images. The human anatomy collection adds 2,234 BodyParts3D meshes across 15 systems, with search, isolation and separation. BodyParts3D geometry is attributed under CC BY 4.0; adapted Human Atlas application code retains its MIT licence. This adult male reference does not cover every anatomical variation.

This is a study surface, not a clinical tool: the records and modules it links to own every threshold, dose and decision rule, and it asserts nothing about a patient.

References & bibliography

Sources for the whole eye, tissue layers, muscle actions, accommodation, aqueous flow, glaucoma mechanisms, brain and whole-body anatomy, and teaching illustrations. Structure-specific references remain beside each model. These sources support the teaching content; they do not validate generated images or certify the rendered geometry. Clinical review pending.

View OptoGuide’s shared bibliography
  1. Human lens dimensions and ciliary ring changes measured by MRI (2018).
  2. NCBI Bookshelf: Neuroanatomy, Cranial Nerve 2 (Optic)
  3. Kolb H. Gross Anatomy of the Eye. Webvision.
  4. Helga Kolb, Webvision: Simple Anatomy of the Retina
  5. Rehman I, et al. Anatomy, Head and Neck, Eye. StatPearls.
  6. Ludwig et al. Corneal anatomy
  7. National Eye Institute. How the Eyes Work.
  8. Torricelli et al. Corneal epithelial basement membrane: structure, function and disease (2013)
  9. Ultrahigh-resolution OCT imaging of the human cornea
  10. Gupta et al. In vivo SS-OCT imaging of crystalline lens sutures (2020)
  11. Kuszak, Zoltoski & Tiedemann. Development of lens sutures (2004)
  12. Johnson et al. Comparison of morphology of human macular and peripheral Bruch’s membrane in older eyes (2007)
  13. The retinal pigment epithelium in health and disease (2010)
  14. Examination of the vitreolenticular interface in relation to uneventful phacoemulsification over one year (2024)
  15. Kim et al. Direct visualization of aqueous tear secretion from lacrimal gland (2017)
  16. Lorber & Vidić. Measurements of lacrimal glands from cadavers (2009)
  17. TFOS DEWS II Tear Film Report (2017)
  18. King-Smith et al. The contribution of lipid layer movement to tear film thinning and breakup (2009)
  19. Choi & Tichenor. Regional Conjunctival Differences in Glycocalyx Mucin Expression in Dry Eye and Normal Subjects (2024)
  20. Wood et al. Histochemical comparison of human and rat lacrimal glands (2022)
  21. Vigneswaran et al. Epithelial cells in normal major and accessory human lacrimal glands (1990)
  22. Kamoi et al. Human lacrimal acinar secretory vesicles: normal-control ultrastructure (2012)
  23. Hwang. Surgical anatomy of the upper eyelid (2013)
  24. Kakizaki et al. Lower eyelid retractors in Caucasians: cadaveric histology (2009)
  25. Microscopic characteristics of the inferior tarsal muscle and its surroundings in Korean cadavers (2013)
  26. Hwang. Surgical anatomy of the lower eyelid relating to lower blepharoplasty (2010)
  27. MR and CT Imaging of the Normal Eyelid and its Application in Eyelid Tumors (2020)
  28. Boote et al. Scleral structure and biomechanics
  29. Nickla & Wallman. The multifunctional choroid
  30. van Zyl et al. Cell atlas of the human ocular anterior segment (2022)
  31. Iris sphincter and dilator anatomy
  32. Ciliary body and ciliary process anatomy
  33. Aliancy & Mamalis. Crystalline lens
  34. Danysh & Duncan. The lens capsule (2009)
  35. Human vitreous architecture in vivo
  36. Human vitreous base anatomy and variation
  37. Kolb et al. Architecture of the human fovea
  38. Campbell et al. Human retinal vascular plexuses
  39. Salazar et al. Human optic nerve anatomy
  40. StatPearls. Anatomy, Head and Neck: Eyelid
  41. StatPearls. Benign eyelid lesions (lid margin, grey line and lamellae)
  42. Knop et al. Meibomian gland anatomy and physiology (2011)
  43. StatPearls. Anatomy, Head and Neck: Eyelash
  44. StatPearls. Superior tarsal (Müller) muscle
  45. StatPearls. Anatomy, Head and Neck: Eye Conjunctiva
  46. Ubels et al. Gene expression in human accessory lacrimal glands of Wolfring (2012)
  47. Lopez et al. The vascular system of the upper eyelid: anatomical study (2008)
  48. Kiranantawat, Suhk & Nguyen. The Asian eyelid: relevant anatomy (2015)
  49. Diagnostic imaging of the nasolacrimal drainage system, Part I
  50. Ozcelik Erdem et al. Endoscopic anatomy of the lacrimal sac: a cadaveric study (2022)
  51. Webvision. Photoreceptors
  52. Kolb. Retinal glia
  53. Human RPE organelle ultrastructure (volume electron microscopy)
  54. Lindell et al. Human RPE membranes and organelle polarity
  55. Tamm. Trabecular meshwork outflow pathways (2009)
  56. Anterior chamber angle anatomy
  57. University of Iowa. Basic Science Course in Ophthalmology: Strabismus (2017), ocular movements and yoke muscles, pp. 13–14. Hosted by AAPOS.
  58. Clark & Demer. Functional morphometry demonstrates extraocular muscle compartmental contraction during vertical gaze changes. J Neurophysiol, 2016.
  59. Neural Control of Vergence and Ocular Accommodation. Annual Review of Vision Science, 2025.
  60. Le et al. Compartmental innervation of the superior oblique muscle in mammals. IOVS, 2015.
  61. Demer et al. Evidence for a pulley of the inferior oblique muscle. IOVS, 2003.
  62. Demer, Oh & Poukens. Evidence for active control of rectus extraocular muscle pulleys. IOVS, 2000.
  63. Kono, Clark & Demer. Active pulleys: MRI of rectus muscle paths in tertiary gazes. IOVS, 2002.
  64. Zanganeh & Legault. Extraocular muscle actions and innervation.
  65. Abdelhady et al. Superior oblique anatomy.
  66. StatPearls. Inferior oblique anatomy.
  67. Khadia et al. Eyeball simulator for extraocular muscles. IJO, 2023.
  68. Clinical Methods. Diplopia: eye movements and examination.
  69. Dubbelman et al. In-vivo lens shape changes with accommodation (2005).
  70. Croft et al. Lenticular and extralenticular accommodation in humans and monkeys (2013).
  71. Purves et al. Formation of images on the retina. Neuroscience.
  72. Goldberg. Computer-animated model of accommodation (2011): proposed reciprocal zonular action.
  73. University of Queensland. Theory of vergences.
  74. National Eye Institute. Glaucoma and eye pressure.
  75. National Eye Institute. Types of glaucoma.
  76. AAO EyeWiki. Primary versus secondary angle closure.
  77. Goel et al. Aqueous humor dynamics: a review.
  78. Carreon et al. Aqueous outflow: a continuum from trabecular meshwork to episcleral veins (2017)
  79. Johnson, McLaren & Overby. Unconventional aqueous humor outflow: a review (2017)
  80. OpenStax. Central nervous system
  81. Purves et al. Neuroscience, 2nd ed. Internal Anatomy of the Cerebral Hemispheres and Diencephalon (2001).
  82. Purves et al. Neuroscience, 2nd ed. The Ventricular System (2001).
  83. Schmolesky. Webvision: The Primary Visual Cortex (updated 2007).
  84. Purves et al. Neuroscience, 2nd ed. Neural Control of Saccadic Eye Movements (2001).
  85. McGovern Medical School. Neuroanatomy Online: The Brain Stem — Overview.
  86. Purves et al. Neuroscience: The retinotopic representation of the visual field (2001).
  87. Purves et al. Neuroscience: Central projections of retinal ganglion cells (2001).
  88. Lieber & Fernandez-Miranda. Anatomy of the orbit (2020)
  89. Imaging of the Primary Visual Pathway based on Visual Deficits (2021).
  90. Nerve fibre organisation in the human optic nerve and chiasm: what do we really know? (2024).
  91. Guedes J, et al. A Morphometric Study of the Pars Plana of the Ciliary Body in Human Cadaver Eyes. Vision. 2024;8(2):30.
  92. Lieber S, Fernandez-Miranda JC. Anatomy of the Orbit. J Neurol Surg B Skull Base. 2020;81:319–332.
  93. Elsevier. Complete Anatomy: Iliotibial tract.
  94. OpenStax. Anatomy and Physiology 2e: Mouth, pharynx and oesophagus.
  95. OpenStax. Anatomy and Physiology 2e: Fibrous joints.
  96. OpenStax. Anatomy and Physiology 2e: Digestive organisation and peritoneum.
  97. University of Michigan. BlueLink: Neck learning objectives (2025), laryngeal skeleton and vocal ligaments.
  98. FIPAT / IFAA. Terminologia Anatomica Humana: hepatovenous segment taxonomy (FMA mappings).
  99. OpenStax. Heart anatomy
  100. OpenStax. Anatomy and Physiology 2e: Blood vessels.
  101. OpenStax. Anatomy and Physiology 2e: The lungs.
  102. OpenStax. Respiratory structures
  103. OpenStax. Anatomy and Physiology 2e: Liver, pancreas and gallbladder.
  104. OpenStax. Anatomy and Physiology 2e: The stomach.
  105. OpenStax. Anatomy and Physiology 2e: Small and large intestines.
  106. OpenStax. Anatomy and Physiology 2e: Kidney anatomy.
  107. OpenStax. Anatomy and Physiology 2e: Urine transport.
  108. OpenStax. Anatomy and Physiology 2e: Testicular reproductive system.
  109. OpenStax. Anatomy and Physiology 2e: Lymphatic and immune anatomy.
  110. OpenStax. Anatomy and Physiology 2e: Pituitary and hypothalamus.
  111. OpenStax. Adrenal glands
  112. OpenStax. Anatomy and Physiology 2e: Bone structure.
  113. OpenStax. Anatomy and Physiology 2e: The skull.
  114. OpenStax. Anatomy and Physiology 2e: Vertebral column.
  115. OpenStax. Anatomy and Physiology 2e: Skeletal muscle interactions.
  116. OpenStax. Anatomy and Physiology 2e: Connective tissues.
  117. OpenStax. Anatomy and Physiology 2e: Skin layers.
  118. OpenStax. Anatomy and Physiology 2e: Sensory perception.
  119. OpenStax. Anatomy and Physiology 2e: Upper-limb bones.
  120. OpenStax. Anatomy and Physiology 2e: Lower-limb bones.
  121. OpenStax. Anatomy and Physiology 2e: Abdominal and thoracic muscles.
  122. OpenStax. Anatomy and Physiology 2e: Upper-limb muscles.
  123. OpenStax. Anatomy and Physiology 2e: Lower-limb muscles.
  124. OpenStax. Anatomy and Physiology 2e: Circulatory pathways.
  125. OpenStax. Anatomy and Physiology 2e: The thoracic cage.
  126. OpenStax. Anatomy and Physiology 2e: Axial muscles of the head, neck and back.
  127. Doane. Blinking and the mechanics of the lacrimal drainage system (1981)
  128. Sato et al. Chronologic analysis of tear dynamics on blinking using quantitative manometry (2022)
  129. Evaluation of lacrimal tear drainage using dynamic fluoroscopic dacryocystography (2011)
  130. Murgatroyd et al. Relative contribution of the superior and inferior canaliculi (2004)
  131. Staurenghi et al. Proposed lexicon for anatomic landmarks in normal posterior segment SD-OCT: the IN•OCT consensus (2014)
  132. Spaide & Curcio. Anatomical correlates to the bands seen in the outer retina by optical coherence tomography (2011)
  133. Cuenca et al. Cellular characterization of OCT and outer retinal bands using specific immunohistochemistry markers (2018)
  134. Kolb. Gross anatomy of the eye (Webvision)
  135. Kaur & Gurnani. Slit-lamp biomicroscope (StatPearls)
  136. Anterior Chamber Angle Assessment Techniques: A Review
  137. European Glaucoma Society Terminology and Guidelines for Glaucoma, 4th Edition — Part 1
  138. Wies6014. Normal macular OCT — published image source
  139. Mikael Häggström. Normal right-eye fundus, as described by its photographer — published image source
  140. Baristoprak~commonswiki (source attribution). Corneal optical-section anatomy example — published image source
  141. Delamere. Ciliary body and ciliary epithelium (2005)
  142. Barron et al. Human optic nerve head conduction anatomy (2004)
  143. Anatomy of cornea and ocular surface
  144. Endotext. Development and microscopic anatomy of the pituitary gland
  145. UTHealth. Neuroanatomy Online: trochlear nerve
  146. OpenStax. Anatomical terminology
  147. OpenStax. Epithelial tissue and polarity
  148. OpenStax. Autonomic reflexes and homeostasis
  149. Endotext. Radiology of the pituitary
  150. OpenStax. The cranial nerve exam: nerve names and numbering
  151. National Eye Institute. Eye glossary
  152. Müller, Marfurt, Kruse & Tervo. Corneal nerves: structure, contents and function (2003)
  153. Al-Aqaba et al. Corneal nerves in health and disease (2019)
  154. Li, Hayashida, Chen & Tseng. Niche regulation of corneal epithelial stem cells at the limbus (2007)
  155. Sebag & Balazs. An anatomic consideration of vitreoretinal adhesions (1984)
  156. Hayreh. Blood flow in the optic nerve head and factors that may influence it (2001)
  157. Morphological evaluation of normal human corneal epithelium
  158. Composition, Structure and Function of the Corneal Stroma
  159. Descemet's membrane development, structure, function and regeneration
  160. Dynamic Regulation of Barrier Integrity of the Corneal Endothelium
  161. The pre-Descemet's layer: discovery, characterisation, clinical and surgical applications, and the controversy
  162. Re: Human corneal anatomy redefined: a novel pre-Descemet layer
  163. New Gonioscopy Technique for Finding Schwalbe's Line: The Ortiz Maneuver
  164. Contemporary Approach to Narrow Angles
  165. NCBI Bookshelf: Upper Eyelid Blepharoplasty, anatomy
  166. AAO EyeWiki: Extraocular Muscles
  167. NCBI Bookshelf: Pupillary Light Reflex
  168. NCBI Bookshelf: Anatomy, Head and Neck: Eye Iris Sphincter Muscle
  169. NCBI Bookshelf: Horner Syndrome
Schematic bibliography · textbooks and chapters
  • Snell RS, Lemp MA. Clinical Anatomy of the Eye, 2nd ed. Blackwell, 1998, ch. 6.
  • Remington LA. Clinical Anatomy and Physiology of the Visual System, 3rd ed. Elsevier, 2012, ch. 2.
  • Wilson et al. The Corneal Basement Membranes and Stromal Fibrosis (2018), PMID 30098200.
  • Remington LA. Clinical Anatomy and Physiology of the Visual System, 3rd ed. Elsevier, 2012, ch. 4.
  • Kolb H. Simple anatomy of the retina. In: Webvision: The Organization of the Retina and Visual System. University of Utah, 2012 (webvision.med.utah.edu).
  • Snell RS, Lemp MA. Clinical Anatomy of the Eye, 2nd ed. Blackwell, 1998, ch. 6 and 7.
  • Alward WLM. Color Atlas of Gonioscopy, 2nd ed. American Academy of Ophthalmology, 2008 (landmark order).
  • Snell RS, Lemp MA. Clinical Anatomy of the Eye, 2nd ed. Blackwell, 1998, ch. 3 and 4.
  • Remington LA. Clinical Anatomy and Physiology of the Visual System, 3rd ed. Elsevier, 2012, ch. 9.
  • von Noorden GK, Campos EC. Binocular Vision and Ocular Motility, 6th ed. Mosby, 2002, ch. 3.
  • Snell RS, Lemp MA. Clinical Anatomy of the Eye, 2nd ed. Blackwell, 1998, ch. 5.
  • Snell RS, Lemp MA. Clinical Anatomy of the Eye, 2nd ed. Blackwell, 1998, ch. 10.
  • Miller NR, Newman NJ (eds). Walsh and Hoyt’s Clinical Neuro-Ophthalmology, 6th ed. Lippincott Williams & Wilkins, 2005.
  • Kardon RH. Anatomy and physiology of the autonomic nervous system. In: Miller NR, Newman NJ (eds). Walsh and Hoyt’s Clinical Neuro-Ophthalmology, 6th ed. 2005.

Model and software credits

Human Atlas application code is MIT licensed. BodyParts3D geometry is © The Database Center for Life Science, licensed under CC BY 4.0. These credits describe asset provenance and reuse permissions, separately from the clinical references above.

Human atlas attributionExamination image creditsEye and orbit attributionMIT licenceCC BY 4.0 licence