Skin
A condition where things that are close to you appear clear and things that are far appear blurry.
S.B Astigmatism
a defect in the eye or in a lens caused by a deviation from spherical curvature, which results in distorted images, as light rays are prevented from meeting at a common focus.
what is periodontitis? SB Pg 50
It is pain or ringing in the ears after expose sure to excessively loud sounds.