photoreceptor cells in retina

fiber night vision pigment photon horizontal cones layers model ganglion canes brain bipolar scheme cornea scientific vitreous blindness labelled astigmatism background photoreceptor cells eyesight nerve cell lower light rode synaptic vesicle visual stalk retinal human eye mitochondria nucleus sensitive cone rod sensory neuron sight macula ophthalmic eyeball conjunctiva ophthalmologist disease color rods science structure medicine health biology optic sclera ophthalmology retina anatomy education medical vector lens iris pupil care looking diagram peripheral