Need the chin rest to steady the patient's head, and to make it comfortable for them. C'mon, you should know this - when was the last time you had an eye exam. Oh, and if you were just being sarcastically funny, then, "Ohh...tee hee hee hee" =P
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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Need the chin rest to steady the patient's head, and to make it comfortable for them. C'mon, you should know this - when was the last time you had an eye exam. Oh, and if you were just being sarcastically funny, then, "Ohh...tee hee hee hee" =P