31. The visual defects are due to photoreceptor dystrophy. 32. The ciliary photoreceptor cells resemble molecularly and morphologically the cones of the human eye. 33. Humans and other species with three such types of color photoreceptor are known as trichromats. 34. Each photoreceptor cell consists of two main sections, the cell body and the rhabdomere. 35. When light hits a photoreceptive pigment within the photoreceptor cell, the pigment changes shape. 36. Thus, a rod or cone photoreceptor actually releases less neurotransmitter when stimulated by light. 37. Therefore, the response of a single photoreceptor is ambiguous when it comes to color. 38. Their method of action is simply as follows : melatonin activates rod photoreceptor disc shedding. 39. These eyes contain more photoreceptor cells that are shaded by pigment cells forming a cup. 40. Ribbon synapses are found in retinal photoreceptor cells, retinal bipolar cells, and pinealocytes.
