B14 supplement - eyes

what is a function of a cornea?

refracts light entering the eye

what is a function of a iris?

controls pupil size

what is a function of a pupil?

Hollow opening that allows light into our eyes

what is a function of a lens?

refracts/focuses light to accurately point at the retina

what is a function of retina?

contains light receptors

What happens to the pupil when there is a bright light? mention circular muscle and radial muscle

The circular muscle (outside muscle) contracts and radial muscle (inside muscle) relaxes, allowing the pupil to be shrink allowing less light rays to enter.

What happens to the pupil when there is a dim light? mention circular muscle and radial muscle

The circular muscle (outside muscle) relax and radial muscle (inside muscle) contract, allowing the pupil to expand which allows more light rays to enter.

What does accommodation mean?

Changing the shape of the lens to focus on objects which are far or close.

What happens to the lens when viewing close objects? mention suspensory ligament and ciliary muscle

The ciliary muscle contracts and the suspensory ligament slacken, allowing the lens to be fat and big, leading to stronger refraction

What happens to the lens when viewing far objects? mention suspensory ligament and ciliary muscle

The ciliary muscle relaxes and the suspensory ligament becomes tight, allowing the lens to be long and thin, leading to weaker refraction

What does the retina contain?

retina contains light receptors rod and cone

what are rod cells? for dim light

rod cells work best in low light as they are highly sensitive to light but can only provide in black and white

what are cone cells? for bright light

Cone cells work best in bright light, they detect color and provide visual acuity but cannot work so well in dim light.

Where is fovea located and what does it do?

fovea is a small region in retina which contains high concentration of cone cells, providing high visual acuity