physio 2.1

amount of deflection of a ray of light that happens when traveling in a straight path through a transparent material

• Refractive Power

• Reflective Power

• Deflection Property

• Diopter

refractive power of the eye

• 10-50 diopters

• 0.2-2 diopters

• 55-75 diopters

• 58-62 diopters

Most of the refractive power of the eye results from the surface of the cornea. Light must have a clear pathway to be clearly focused on the sensory receptors of the cornea.

• first is true, second is false

• first is false, second is true

• both are true

• both are false

Answer explanation

Light must have a clear pathway to be clearly focused on the sensory receptors of the RETINA.

A diometer is a measure of the power of a lens. 10 diopters is the ability to focus parallel light rays at a distance of 1 meter.

• first is true, second is false

• first is false, second is true

• both are true

• both are false

Answer explanation

A DIOPTER is a measure of the power of a lens. 1 DIOPTER is the ability to focus parallel light rays at a distance of 1 meter.

distance of retina from behind the refractive center of the eye

• 2 μm

• 17 mm

• 10 diopters

• 22 μm

an occurrence where refractive power can be increased to 34 diopters by changing shape of the lens - making it fatter (more convex)

• accomodation

• refraction

• reflection

• deflection

position of normal image on the retina

(a)  

biconvex crystal-like structure that is held in place by a suspensory ligament attached to the ciliary body

• retina

• pupil

• lens

• iris

thin layer of tissue that lines the back of the eye on the inside and is located near the optic nerve

• iris

• lens

• pupil

• retina

sensory innervation of the eye

• optic nerve

• oculomotor nerve

• abducens nerve

• trochlear nerve