• attempt
  • By a series of auxiliar-y bevels or secondary surfaces these areas are `ground away in an attempt to obtainthe best approximate `fit of the cornea. (google.com)
  • either
  • l) Such a small lens nearly always causes lid `irritation in blinking due to the fact that the margin of the lids contains the greatest concentration of nerve endings and, (2) such lenses lslip readily due to lid action and will either be displaced off the cornea or fall out of the eye. (google.com)
  • vision
  • Keratoconus usually becomes apparent between the ages of 10 and 25 years, and is sometimes associated with other conditions such as allergies, infantile eczema, asthma, reduced night vision, double jointedness, and in rare instances, with occasional short bouts of chest pain. (murwillumbahoptometrist.com.au)