ETYM Latin accommodatio, from accommodare: cf. French accommodation.
1. (Physiology) The automatic adjustment in focal length of the lens of the eye.
2. A settlement of differences.
3. In the theories of Jean Piaget: the modification of internal representations in order to accommodate a changing knowledge of reality.
4. Living quarters provided for public convenience.
5. The act of providing something (lodging or seat or food) to meet a need.
Adjustment, especially of eye muscles; adaptation; lodgings; loan. accommodation bill, bill of exchange co-signed by a guarantor. accommodation train, American, train stopping at all or most stations.
In biology, the ability of the eye to focus on near or far objects by changing the shape of the lens.
For an object to be viewed clearly its image must be precisely focused on the retina, the light-sensitive layer of cells at the rear of the eye. Close objects can be seen when the lens takes up a more spherical shape, far objects when the lens is flattened. These changes in shape are caused by the movement of ligaments attached to a ring of ciliary muscles lying beneath the iris.
From about the age of 40, the lens in the human eye becomes less flexible, causing the defect of vision known as presbyopia or lack of accommodation. People with this defect need different glasses for reading and distance vision.