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Introduction to Ocular Anatomy & Physiology
1. Gopi Suresh Vankudre
M. Optom, FIACLE
INTRODUCTION TO
OCULAR ANATOMY
& PHYSIOLOGY
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2. Anatomy vs Physiology
Anatomy
Physiology
• Anatomy is the
identification and
description of the
structures of living things
• Physiology is the science of
life that helps us
understand how the body
works
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4. Important facts about eye
• Human eye is sensitive to visible spectrum
i.e 380am – 780nm
• Elements in the eye converts light signals to
neural signals
• Protected by bony orbit
• Supplied by sensory and motor nervous
system
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5. Let us revise few anatomic
concepts!
•
•
•
•
•
•
•
•
Anterior/ventral
Posterior/dorsal
Superior/cranial
Inferior/caudal
Medial
Lateral
Proximal
Distal
• Sagital
• Coronal
• Transverse
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6.
7. Review of basic human histology
• Histology- Branch which
deals with bodily
microscopic structures
• Tissue – Collection of
similar cells involved in
similar function
• Body is made from four
basic tissues
–
–
–
–
Epithelium
Connective
Muscle
Nervous
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8. Epithelium
• Covers the external surface
• Lie on basement membrane
• Classified according to
shape
–
–
–
–
Squamous or flat
Cuboidal
Columnar
Simple or stratified
• Endothelium
9. Glandular Epithelium
• Glands are epithelial cells
gathered in group adapted
for secretion
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10. Connective tissue
Provides structure and
support
Consist of cells, fibers and
ground substance
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12. Nerve tissue
• Consist of two cells neurons
and neuroglia
• Neuron carries stimulus
• Neroglia provide structure
and metabolic support
• Dendrites
• Axons
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13. Review of important physiological
concepts
• Nucleus directs cell
function.consist of DNA and
RNA
• Rough endoplasmic
reticulum(ER) creates
proteins and smooth ER
synthesizes protein and
lipid
• Golgi apparatus modify and
pack proteins
• Cell membrane – Central
hydrophobic lipid layer and
hydrophilic phosphate
groups on both sides
• Mitochondria produces
cell’s supply of energy in the
form of adenosine
triphosphate (ATP)
• Lysozymes acts like a
defence mechanism
14.
15. Passive transport mechanism
• Passive fluid and solute
transport by diffusion
which does not require
energy
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16. Active transport mechanism
• Active transport
mechanism requires
energy
• Energy is supplied by
ATP molecule which is
produced either by
aerobic or anaerobic
process
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17. Intercellular junctions related to
eyes
• Zonula occludens: Joining with the adjacent
cells
• Hemidesmosomes: Provides strong
connection between the cell and its
basement membrane and underlying tissue
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18. External Anatomy of the Eye
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19. Lacrimal Apparatus of the Eye
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20. Anatomy of the Eyeball
• Fibrous Tunic:
– Cornea
– Sclera
• Vascular Tunic
– Choroid coat
– Ciliary Body (Ciliary muscle, Ciliary process)
– Iris
• Nervous Tunic
– Retina
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25. Production of Aqueous Humor
and Intraocular pressure
1. Ciliary Process:
Produces Aqueous Humor
2. Posterior Chamber:
Aqueous Humor flows from
this chamber through the
pupil in Anterior Chamber
3. Canal of Schlemm
Reabsorbs Aqueous Humor
Glaucoma:
Increase in intraocular
pressure due to build up of
Aqueous Humor
26. Opthalmoscopic view of the retina showing
the location of the Macula to the Optic Disc
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31. Abnormalities of
The Eye:
1. Myopic nearsighted
2. Hypermetropic Farsighted
3. Presbyopia age-related failure of
lens to accommodate
4. Astigmatism Distorted vision due to
irregular-shaped lens or
cornea
5. Color Blindness genetic defect that
causes dysfunction of
cones
32. Accommodation of the Lens
for near vision
• Ciliary muscles contract
• Ciliary body pulls forward and inward
• Tension on suspensory ligaments of lens is
decreased
• Lens becomes thicker (rounder) due to its
elasticity
• Pupils constricts
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33. Accommodation of the Lens
for far vision
• Ciliary muscles relaxes
• Ciliary body returns to its resting state,
backward and outward
• Tension on suspensory ligaments of lens is
increased
• Lens becomes thinner (flatter) due to its
elasticity
• Pupils dilate
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