Emetropia or Emmetropia: How To spell?
The word Emetropia is misspelled against Emmetropia, a noun meaning "That refractive condition of the eye in which the rays of light are all brought accurately and without undue effort to a focus upon the retina; -- opposed to hypermetropia, myopia, an astigmatism."
Emmetropia has double "mm" is mispronounced as "m"Remember double 'MM' in between the strings e & etropia which should not be misspelled with single 'M'
Wrong Spelling:  e-m-etropia  Correct Spelling:  e-mm-etropia 
Find more incorrect spellings of Emmetropia to spell right way.