Assertion: fish | /r/CapableOf | adjust focus
Facets:
value: by moving the lens
type: MANNER
value: normally
type: DEGREE
Source sentences:
text: Birds and mammals (including humans) normally adjust focus by changing the shape of their lens, but fish normally adjust focus by moving the lens closer to or further from the retina.
text: Fish have a refractive index gradient within the lens which compensates for spherical aberration Unlike humans, most fish adjust focus by moving the lens closer or further from the retina Teleosts do so by contracting the retractor lentis muscle.
text: Whereas birds and mammals achieve accommodation by deforming the lens of their eyes, fish and amphibians normally adjust focus by moving the lens closer or further from the retina.