Physics of the eye
What type of waves does light use to travel into the eye?
Electromagnetic waves
What is the white outer layer of the eye called?
The sclera
What part of the eye contains rods and cones?
The retina
What is the range of visible light wavelengths in nanometers?
About 380 nm to 750 nm
is the most common non-surgical vision correction method?
Glasses and contact lenses
What structure does light enter first in the eye?
The cornea
What clear dome-shaped structure refracts light at the front of the eye?
The cornea
What cells are responsible for color vision and sharp detail?
Cones
Which cones detect short wavelengths (blue light)?
S-cones
What surgical procedure uses a laser to reshape the cornea?
LASIK
What two structures act together like a single convex lens system?
The cornea and the lens
What colored part of the eye controls how much light enters?
The iris
What cells are responsible for low-light and peripheral vision?
Rods
Which cones detect medium wavelengths (green light)?
M-cones
What vision correction option sits directly on the eye and improves field of vision?
Contact lenses
What is the orientation of the image formed on the retina?
Inverted (upside down)
What fluid-filled space helps maintain eye pressure in the front of the eye?
Aqueous humor
What part of the retina is responsible for sharp central vision?
The fovea (in the macula)
Which cones detect long wavelengths (red light)?
L-cones
What implanted device is used for people who do not qualify for LASIK?
Implantable collamer lens
What process allows the brain to interpret the inverted image correctly?
The brain automatically flips it upright
What vascular layer supplies oxygen and nutrients to the retina?
The choroid
What is the process called when light is converted into electrical signals?
Phototransduction
What causes red-green color blindness?
A deficiency in one or more types of cones
What is the main difference between glasses/contacts and LASIK in how they correct vision?
Glasses/contacts externally bend light, while LASIK permanently reshapes the cornea