Lens (vision)
Light from a single point of a distant object and light from a single point of a near object being brought to a focus by changing the curvature of the lens. |
The lens or crystalline lens is a component of the eye. In concert with the cornea, it refracts light, focussing it onto the retina.
The lens is clear and flexible; its curvature is controlled by ciliary muscles. By changing the curvature of the lens, one can focus the eye on objects at different distances from it.
The lens is about 5 mm wide and has a diameter of about 9 mm for an adult human (though these figures can vary). The lens is included into the capsular bag, maintained by the zonules of Zinn.
Diseases of the eye
- A cataract is when the normally transparent crystalline lens develops opacities and leads to blurry vision.
See also
- visual perception
- eye
- iris
- lens (optics)
- intraocular lens
- capsular bag
- capsulorhexis
- phacoemulsification
- zonules of Zinn
- aphakia, the absence of the natural crystalline lens of the eye.
| Sensory system – Visual system – Eye | Edit |
| Optic disc – Retina – Cornea – Iris – Pupil – Lens – Macula – Sclera – Optic fovea – Blind spot – Vitreous humour – Aqueous humour – Choroid – Ciliary body – Conjunctiva – Angle structure – Tapetum lucidum |
| Sensory system – Visual system |
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Eye - Optic nerve - Optic chiasm - Optic tract - Lateral geniculate nucleus - Optic radiations - Visual cortex |
Categories: Anatomy stubs | Eye