All the Dimension of an Eye
Eyeball occupies 1/5th volume of an orbit.
Orbit
|
Horizontal
|
40mm
|
Vertical
|
35mm
|
|
Volume
|
30ml/cc
|
|
Depth
|
45-55mm
|
|
Optic Canal
|
Length
|
8-10mm
|
Interpupillary Distance
|
60mm
|
|
Optic Nerve
|
Intraocular
|
1mm
|
Intraorbital
|
30mm
|
|
Intracanalicular
|
6-9mm
|
|
Intracranial
|
10mm
|
|
Optic Canal
|
Length
|
8-10mm
|
Width
|
5-7mm
|
|
Sclera
|
Thickness (posteriorly)
|
1mm
|
Thickness (at the insertion of EOM)
|
0.3mm
|
|
Lens
|
Diameter
|
9-10mm
|
Thickness
|
3.5mm-5mm
|
|
Anterior radius of Curvature
|
10mm
|
|
Posterior radius of Curvature
|
6mm
|
|
Capsule (Equator)
|
14
|
|
Capsule (pole)
|
3
|
|
Cornea
|
Horizontal Diameter
|
11.7mm
|
Vertical Diameter
|
11mm
|
|
Thickness (peripheral)
|
1-1.2mm
|
|
Thickness (central)
|
0.5-0.6mm
|
|
Radius of curvature (anterior)
|
7.8mm
|
|
Radius of curvature (Posterior)
|
6.5mm
|
|
Retina
|
Foveola
|
0.35mm
|
Fovea
|
1.5mm
|
|
Parafoveolar
|
2.5mm
|
|
Perifoveolar
|
5mm
|
|
Macula lutea
|
5.5mm
|
|
FAZ (Fovealar avasacular zone)
|
0.8mm
|
|
Number of Rods
|
120million
|
|
Number of Cones
|
6.5million
|
|
Eye ball
|
AP Diameter
|
24mm
|
Horizontal Diameter
|
23.5mm
|
|
Vertical
|
23mm
|
|
Circumference
|
75mm
|
|
Volume
|
6.5mm
|
|
Weight
|
7g
|
|
Uvea
|
Pars Plicata
|
2mm
|
Pars plana
|
4mm
|
|
Cilairy body (diameter)
|
0.5mm
|
|
Ciliary body (length)
|
2mm
|
|
Anterior Chamber
|
Depth
|
2.5mm
|
Volume
|
0.25ml
|
|
Posterior Chamber
|
Depth
|
|
Volume
|
0.06ml
|
|
Vitreous
|
Volume
|
4ml
|
Intraocular pressure
|
10-21mm of Hg
|
|
Aqeous Humor
|
Rate of production
|
2µl/min
|
Rate of outflow
|
0.22 µl/min/ mm of Hg
|
|
Diurnal variation in pressure
|
< 5mm og Hg (>8 glaucomatous)
|
|
Diastolic BP-IOP
|
>55 mm of Hg
|
|
Cup Disc
|
Ratio
|
0.3 (<0.2 assymetrical cups)
|
Lid
|
Aperture (Vertical Height)
|
10-20mm (8-12mm in female
7-10mm in male)
|
Aperture (Horizontal )
|
28-30mm
|
|
Lidmargin thickness
|
2mm
|
|
Lateral canthus
|
2mm higher than medial canthus
|
|
Upper lid crease
|
10mm (female) 8mm (male)
|
|
Meibomian gland
|
Number Upperlid
|
30-40
|
Number Lower Lid
|
20-30
|
|
Lacrimal apparatus
|
Puncta (upper )
|
6mm temporal to innercanthus
|
Puncta (lower)
|
6.5mm temporal to inner canthus
|
|
Canaliculi Vertical
|
1-2mm
|
|
Canaliculi Horizontal
|
6-8mm
|
|
Lacrimal Sac (Length)
|
12-15mm
|
|
Lacrimal sac (breadth)
|
5-6mm
|
|
Nasolacrimal Duct
|
15-18mm
|
|
Height of marginal tear strip
|
1mm
|
|
Refractive Index
|
Cornea
|
1.37
|
Lens
|
1.42
|
|
Aqueous + Vitreous humor
|
1.33
|
|
Refractive Power
|
Cornea
|
45-47
|
Lens
|
15-13
|
Collected from Comprehensive ophthalmology 5e AK Khurana
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