Exam 3: Visual System: The Eye

Compare and contrast wet macular degeneration and dry macular degeneration.Be sure to discuss at least one commonality and at least one difference.

Why is the location of the optic disc associated with the blind spot?

Ricardo requires glasses to correct a problem in which his lens cannot become thin enough to focus light from more distant objects.What condition does Ricardo have?

A single particle of light is known as ______.

The fire department of Conchburne Falls decides to switch their fire engines from red to blue.What is the most likely result?

Dogs do not perceive the world in color.

The adjustable focusing element of the eye, located right behind the iris of the eye, is known as the ______.

The process of distinguishing where one object ends and the next begins, making edges as clear as possible, is known as ______.

Macular degeneration is a disease that destroys the fovea and the area around it.

Harry is a 90-year-old man.He shows impaired visual acuity and color vision in both eyes, though his peripheral vision is unimpaired.He has difficulties reading even with powerful reading glasses.Your diagnosis?

Which of the following is TRUE of visual acuity in infants?

Latisha is a 22-year-old woman who requires glasses to correct a visual problem.The process of accommodation does not make her lens thick enough to focus the light from closer objects onto the retinae.What condition does Latisha have?

The combination of positive signals coming from bipolar cells and inhibition coming from horizontal cells determines the strength of a signal to a retinal ganglion cell.What does this result in?

Retinal ganglion cells that increase their firing rate (excitation) when light is presented in the middle of the receptive field and decrease (inhibition) their firing rate when light is presented in the outside or surround of the receptive field are known as ______.

Retinal ganglion cells that decrease their firing rate (inhibition) when light is presented in the middle of the receptive field and increase (excitation) their firing rate when light is presented in the outside or surround of the receptive field are known as ______.

The term "visual acuity" refers to the ______ of vision.

Visible light is usually measured by its ______.

Which of the following is TRUE of human vision?

The greatest density of cones can be found in the ______.

Keyon enjoys exploring caves.Upon emerging from a very dark cave, he squints at first, but then he adjusts to the bright sunshine.This process is known as ______ adaptation.