The given blank can be filled with Cones.
The visual acuity can be defined as the clarity of the vision, it is related to the sharpness and the clearness of the image formed. The vision acuity is determined by the optical and the neural factors, it is dependent on the retinal focus and the sensitivity of the nerve cells and the brain.
The cones are the pointed, thick and short sensory receptors, present in the eye. They are responsible for the color vision and the sharpness or the acuity of the image. They work better in brighter light.
