| Eye position24
|
Frontal eyes with highly overlapped binocular vision |
Lateral eyes with less overlapped binocular vision |
| Lens |
Ellipsoidal |
Completely spherical extending partially through iris providing wide-angle view |
| Retina (thickness)25
|
≍289 μm |
≍180 μm |
| Ganglion cells20
|
Highly populated |
Less densely populated |
| Presence of fovea24
|
Yes |
No |
| Vision23
|
Cone dominant and trichromatic vision (lacks UV-sensitive colour vision |
Cone dominant and tetrachromatic vision (contains UV-sensitive short single cones) |
| Retinotectal projection24
|
Half of the optic fibres from each eye project on to the same side of the brain and other half crosses over at the optic chiasm and projects to the other side of the brain |
All of the optic fibres coming from each eye crosses over at the optic chiasm and extends on to the opposite side of the brain |
| Myelination18, 26, 27
|
The part of optic fibres before the lamina cribrosa are not myelinated, whereas fibres after protruding from lamina cribrosa are all myelinated |
Whole optic fibres are myelinated. Loose, single-layer myelin sheath is present around the intra-retinal axon and optic nerve consists of compact myelin |
