Related by context. Frequent words. (Click for all words.) 53 REM sleep 46 Presbyopia 46 Eye 46 restorative sleep 44 Diabetic Retinopathy 43 binocular vision 42 Cataract Surgery 42 arousals 41 Eyesight 41 avoidable blindness 41 nystagmus 40 lucid dreaming 39 CT Scans 39 wakefulness 39 Prosthesis 39 magnetic stimulation 39 paresthesia 39 chronic sleep deprivation 39 alertness 38 Angiography 38 blood oxygen saturation 38 daytime sleepiness 38 Implant 38 Macular degeneration 38 Pinhole 38 sensory input 38 melatonin 37 aliveness 37 hormone melatonin 37 restful sleep 37 wakeful 37 arousal 37 habituation 37 Macular Degeneration 37 palpitation 37 Epinephrine 37 grogginess 37 Chest Pain 36 proprioception 36 retinal 36 distractibility 36 sensorimotor 36 Ghrelin 36 sleep disturbances 36 cataract surgeries 36 Glare 36 drowsiness 36 preventable blindness 36 muscle twitching 36 Vision 36 stimulation 36 Healthbeat 36 emotional arousal 36 mental alertness 36 salivation 36 Retinal 36 Myopic 36 erections 36 emPower 36 attunement 35 fatigue dizziness 35 retinal diseases 35 ophthalmologists 35 Napping 35 tingling sensations 35 sleep disorders 35 Retinitis Pigmentosa 35 sleepiness 35 catnap 35 cataracts 35 thermogenesis 35 dopamine chemical 35 excessive sleepiness 35 dopamine neurotransmitter 35 Melatonin 35 Regenerating 35 hypervigilance 34 Magnification 34 Moorfields Eye Hospital 34 limbic 34 Aerobic exercise 34 Illumination 34 cataract 34 throbbing headache 34 sleep 34 Retina 34 cornea transplants 34 wakening 34 skin conductance 34 corneal transplant 34 visualizing 34 Aneurysm 34 profuse sweating 34 Cornea 34 Implantable 34 muscle rigidity 34 Lightning Strike 34 Twinkling 34 waking 34 overactivity 34 Squint