Explain the following terms connected with the eye:
$(i)$ Ciliary muscles
$(ii)$ Accommodation
$(iii)$ Blind spot.

(N/A) $(i)$ Ciliary muscles: These are the muscles that hold the eye lens in position and control its curvature.
$(ii)$ Accommodation: The ability of the eye lens to adjust its focal length to focus objects at varying distances is called accommodation.
$(iii)$ Blind spot: This is the point on the retina where the optic nerve leaves the eye. There are no photoreceptor cells at this point,so any image formed here is not transmitted to the brain.