Difference between Ciliary muscles and Optical nerves
Ciliary muscles
- Human eye lens has one important characteristic that, it can change its focal length as per the requirement.
- Ciliary glands are present around the lens which helps eyes to change its focal length.
- When we want to see nearby object, focal length of eye lens should be small, to achieve this ciliary muscles pull the lens, makes it thicker so that provide us ability to see nearby object.
- When we want to see distinct objects, ciliary muscles contracts the eye lens, due to this the focal length of lens is increased and we can see distinct objects clearly.
- This adjustment ability of lens which is done with the help of ciliary muscles is known as power of accommodation of eyes.
Optical nerves.
- Retina forms the first image of object, after refracting the rays of light through the converging eye lens.
- The image should be in form of electrical pulses so that brain can read it, for this purpose some nerves are present after retina known as optical nerves.
- Optical nerves are a kind of transducer which converts light energy into electric pulse.
- An optical nerve converts the image in electric pulses of particular frequency and sends it to the brain.
- Brain reads the frequency/wavelength of the signal gives us information about what we have seen.