• corneal
  • The present day art of ttingcorneal contact lenses, generally stated, consists `in selecting a lens made up-of an inner spherical surface (or toric surface) to best t the corneal curves of the eye at the apex o f the cornea and ,then examining -this tit -with iluorescein solution between the lens and theeye. (google.com)
  • Thus in a-n average corneal type contact lens of 410 rnm. (google.com)
  • In an attempt to solve the foregoing problems, it has been suggested in Butterfield U.S. Patent 2,544,246', granted March 6, 1951, that the corneal lens have an inner spherical central area and an outer marginal portion formed by a series of separate and discrete steps to introduce a parabolic fit. (google.com)
  • The result of this suggestion is to produce a surface of uncertain rate of change of curvature when these steps are blended Touhy Patent 2,510,438, ygranted June 6, 1950, discloses a corneal contact lens having a radius of curvature on its concave side slightly greater than the radius of curvature of the cornea with an increasing clearance at the marginal areas of the lens. (google.com)
  • The usual procedure in the art of fitting corneal contact lens is to use a lens of an average of 9.5 mm. diameterthe lenses usually vary from 9.0 to 10.5 mm. in diameter. (google.com)
  • The product was voluntarily recalled on May 25 at the request of the Food & Drug Administration in the wake of data collected and reviewed by the Centers for Disease Control linking the solution to a serious corneal infection known as Acanthamoeba keratitis. (schmidtandclark.com)
  • irritation
  • 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)
  • These solutions provide broad spectrum antimicrobial efficacy together with rapid and complete desorption of the fatty acid antimicrobial from the contact lens material, resulting in a minimization of irritation and sensitization risks to the user. (google.fr)
  • effective
  • Attorney Thomas Moore says his clients are concerned that consumers may be misled by the launch of the old AMO formulation and may incorrectly presume the solution is adequately effective against Acanthamoeba. (schmidtandclark.com)
  • provide
  • Such a lens does not provide an adequate meansof even closely conforming to the shape of the cornea because there can be no spherical surface constructed slightly greater than the radius of curvature of the cornea to which it is applied that will do anything but set up a gradient of pressure on the cornea with a maximum pressure at the apex and a minimum towards the ed-ge. (google.com)
  • compatible
  • To be more specic, according to conventional practice, in -order to make the inner surface of the lens compatible to the cornea, the lens is rst reduced in diameter to as small a size as possible for the purpose of using the .central optic zone of about 6 to 7 mm. in diameter as a bearing surface for the lens. (google.com)
  • step
  • AMO had previously represented to consumers that they could effectively disinfect lenses without a rub step, a practice considered unsafe by many optometrists and ophthalmologists. (schmidtandclark.com)