5. REM
• RAPID EYE MOVEMENT
• Rapid eye movement sleep (REM sleep) is a normal stage of
sleep characterized by the rapid and random movement of the
eyes.
• REM sleep is classified into two categories: tonic and phasic
6. VA
• VISUAL ACUITY
• is acuteness or clearness of vision, which is
dependent on the sharpness of the retinal focus within
the eye and the sensitivity of the interpretative faculty
of the brain.