SEC. 02 - Vision Flashcards
What are the most important parts of the human eye and visual system?
ALL OF THEM!
The Iris which open the clothes as to allowed light to enter.
The Lens which bends to see different focal lengths.
The Fovea for visual clarity.
Rods and cones to see in different lighting conditions.
All of them need to work properly in order to see ….
Humans are able to see clearly using which system over how many degrees of visual angle?
The foveal system.
Its 100% visual clarity at 1 to 3ﾟ of visual angle
** NOTE:
The OTHER/SECOND other part of the visual system is AMBIENT VISION
What is the main difference between the function of rods and cones in the visual system?
Rods
- Dim light
- Black & white vision
Cones
- Daytime vision
- Perception of color
- Packed densely in fovea
- Give sharp image in dayllight
- In the dark … comes are useless
What is the term for when the gaze is held stable on one location or object in space within three (3) degrees of visual angle or less for at least 100 ms?
Fixation
The focal visual system is specialized for the detection of _________?
Objects and locations with clarity.
The parafovea area of the human eye extends from ________ to ________ degrees of visual angle ?
** FIND IN BOOK**
What is the purpose of ambient vision ?
It detects peripheral information, motion & information in low light
What happens to information during rapid saccades ?
Vision is suppressed and the brain fills in the gaps.
What happens/does not happen when eye movements are less than 15ﾟ of visual angle ?
Generally, there is no head movement
How do people generally perform when making estimations of speed and distance ?
Poorly and and inaccurately.
What is the term for when an object approaches the viewer and its image on the retina grows symmetrically and exponentially ?
Looming.
When an object approaches a viewer in a direct or nearly direct line towards them, the angle of approach is said to be ________ ?
Shallow.
When an object approaches a viewer in a direct or nearly direct line towards them the object may appear ________?
Closer, larger and moving faster.
