User Manual

Part Number: PFG01017 Page 7 of 17
Revision A Revision Date: July 2016
Patient Selection
Patients selected to wear the Frequency 55 Toric Contact Lenses referred to in this manual, should be chosen for
their motivation to wear contact lenses, cooperative personality and good general health. Successful contact lens
wear is dependent not only on a well fitted lens, but upon good patient communication and compliance.
Pre-Fitting Examination
A pre-fitting patient history and examination are necessary to:
• Determine whether a patient is a suitable candidate for contact lenses,
• Make ocular measurements for initial contact lens parameter selection,
• Collect and record baseline clinical information to which post-fitting examination results can be prepared.
A pre-fitting examination should include a thorough eye examination, including visual acuity, keratometry,
biomicroscopy and complete patient history.
Fitting Procedures for Frequency 55 Toric Contact Lens
1. Determination of appropriate lens power:
a. Convert spectacle refraction to minus cylinder form.
b. Compensate the spectacle refraction power for vertex distance if the power is greater than ±4.00
diopters.
c. For MINUS lenses, determine the power in this manner:
• For cylinders between –1.00 and –2.00
add +0.25 to sphere power
add +0.25 to cylinder power
• For cylinders between of –2.25
add +0.50 to sphere power
add +0.50 to cylinder power
d. For PLUS lenses, determine the power in this manner:
• Leave the cylinder power unchanged.
• For cylinders between –1.00 and –2.00
add +0.50 to sphere power
• For cylinders between –2.25 and –2.50
add +0.75 to sphere power
NOTE: When the sphere power is within one-half diopter of plano, reduce the recommended
addition of plus by 50%.