Related by context. Frequent words. (Click for all words.) 68 retina 61 optic nerve 57 photoreceptors 56 retinal 56 cornea 55 blood vessels 54 cerebellum 53 nerve cells 53 visual cortex 52 cortex 52 macular degeneration 52 retinal cells 52 related macular degeneration 52 prefrontal cortex 51 vasculature 51 diabetic retinopathy 50 basal ganglia 50 nerve fibers 50 frontal lobe 50 hippocampus 49 myelin 48 retinopathy 48 temporal lobe 48 amyloid plaques 48 retinas 47 cerebral cortex 47 brain 47 retinitis pigmentosa 47 hair follicles 47 capillaries 47 epithelium 47 brainstem 47 dermis 47 pituitary gland 47 neurons 46 frontal lobes 46 thalamus 46 presbyopia 46 fatty tissue 46 fatty deposits 46 corneal 45 motor neurons 45 Barrett esophagus 45 melanocytes 45 peripheral nerves 45 glial cells 45 frontal cortex 45 peripheral vision 45 endothelium 45 prostate gland 45 acetylcholine 45 axons 45 hypothalamus 45 spinal canal 44 intraocular pressure 44 epidermis 44 neurones 44 cortical 44 neurodegeneration 43 lesion 43 digestive tract 43 salivary glands 43 small intestine 43 reactive oxygen species 42 dopamine producing 42 lesions 42 axon 42 glutamate 42 cuticle 42 esophagus 42 astrocytes 42 uveitis 42 elastin 42 cataract 42 mucous membranes 42 neuron 42 lymphatic system 42 insula 42 ventricles 42 amyloid 42 collagen 42 cataracts 42 aorta 42 ultraviolet light 42 gastrointestinal tract 42 pancreas 42 soft tissues 42 mitochondria 41 DNA methylation 41 outer layer 41 glaucoma 41 striatum 41 oxidative stress 41 thyroid gland 41 amygdala 41 mild cognitive impairment 41 pigmentation 41 autonomic nervous system 41 beta amyloid 41 precancerous 41 tooth enamel