Rods + Cones
What makes us see colour?
Cones
What is braille?
a tactile writing system that allows blind and visually impaired individuals to read and write using raised dots that are felt with the fingertips
What is near-sightedness
When people can see close up, but struggle with things far away
What is the retina?
It converts light into electrical signals, which are sent to the brain to create our vision
What does it mean to have 20-20 vision
20/20 vision, a standard measurement of visual acuity, means that a person can see objects at 20 feet away with the clarity that an average person can see them at the same distance
What makes us see black and white + lets us see in low light?
Rods
How do glasses work?
Glasses help the refocus light in the eye, so the light focuses directly on the retina
What is far-sightedness
When someone can see clearly further away, but struggle up close
Where does the retina send the electrical signals it creates?
The optic nerve
What is an eye doctor called?
ophthalmologist or an optometrist
True or False: There are 130 Million photoreceptors in the human eye
True
What is a white cane?
A can that visually impaired people navigate the world through vibrations
What causes near-sightedness and far-sightedness?
Where light focuses in the eye
True or False: The fovea has a large amount of rods
False
Can dogs see the colour blue?
Yes
How many rods are in the eye?
120 million
How could text to speech AND screen reader help the visually impaired?
Text to speech allows people to write using their voice, screen reader reads a webpage out loud to make these things more accessible
What causes glaucoma?
Glaucoma is primarily caused by damage to the optic nerve, most often due to elevated eye pressure
Where in the eye is the retina located?
The back of the eye
How are a cats eye different than a human?
Cat eyes differ from human eyes in pupil shape (vertical slits vs. round), a wider field of view, a higher ratio of rods to cones for low-light and motion detection, and less developed color and detailed vision compared to humans
How many cones are in the eye normally?
7 Million
Why is it important to learn about visual aids?
To break the stigma surrounding visual impairments, and to further understand assistive tech
What causes macular degeneration?
Macular degeneration is caused by damage to the macula, the light-sensitive tissue in the center of the retina, and is linked to age, genetics, lifestyle factors like smoking, and diet
True or false: The Macula is not a part of the retina
False
How are a bats eye and a human eye different?
Bats have superior low-light vision to humans and some can even perceive ultraviolet (UV) light, which is invisible to us. While their vision may not have the same sharpness or color spectrum as humans in bright conditions, their eyes are specifically adapted for seeing in the dark. Many bats use echolocation to navigate and find prey, but vision is still important for spotting large-scale features, complementing their use of sound.