I'd be more likely to use patency, meaning "openness."
The medical root word for hard is "sclero-" or "sclera-".
The medical root word "carpo" refers to the wrist.
The medical root word 'derma' refers to the skin.
The medical root word encephalo refers to the brain.
The medical root word "entero" refers to the intestines.
The medical root word "ophthalmo" refers to the eyes.
The medical root word 'osteo' refers to the bone.
The medical root word 'pilo' refers to the hair.
The medical root word "procto" refers to the rectum.
The medical root word 'rhino' refers to the nose.
I have medical care
Realisation is not a medical word.