5. Define the terms
(a) Blind spot on the retina
(b) Persistence of vision
some
Answers
Answer:
a)The blind spot is where the optic nerve and blood vessels leave the eyeball. The optic nerve is connected to the brain. It carries images to the brain, where they’re processed. This is how we know what we’re seeing. Our eyes see the object or image, and our brain interprets it. Our brains typically fill in any information we need based on the images surrounding our blind spot, so we don’t usually notice it
b)Persistence of vision traditionally refers to the optical illusion that occurs when visual perception of an object does not cease for some time after the rays of light proceeding from it have ceased to enter the eye.The illusion has also been described as "retinal persistence" "persistence of impressions",simply "persistence" and other variations. According to this definition, the illusion would be the same as, or very similar to positive afterimages.
Answer:
(a) Blind spot on the retina: Blind spot, small portion of the visual field of each eye that corresponds to the position of the optic disk (also known as the optic nerve head) within the retina. There are no photoreceptors (i.e., rods or cones) in the optic disk, and, therefore, there is no image detection in this area.
(b) Persistence of vision: Your eye and brain retain a visual impression for about 1/30 of a second. (The exact time depends on the brightness of the image.) This ability to retain an image is known as persistence of vision. ... The eye retains the image of each frame long enough to give us the illusion of smooth motion.