WK1 L2 The eye and the retina

Question 1

Light

Answer 1

The stimulus for vision

Question 2

Pupil

Answer 2

Controls the amount of light that enters the eye

Question 3

retina

Answer 3

thin sheet of neural tissue that lines the inner wall of the eye- made up of rods and cones

Question 4

Pigment epithelium

Answer 4

Contains enzymes and nutrients

Question 5

The blind spot

Answer 5

there are no receptors at the place where the optic nerve leaves the eye

Question 6

Fovea

Answer 6

a small area in the retina that only contains cones (acuity is the best in the foveal region)

Question 7

Duplicity theory

Answer 7

that the two types of receptors operate under different conditions and have different properties

Question 8

spectral sensitivity

Answer 8

the receptors’ sensitivity to light at each wavelength across the visible spectrum

Question 9

Neural circuits

Answer 9

a number of neurons that are connected by synapses. The electrical signals generated in the receptors are processed as they travel through these neural circuits