Professional Fitting Guide Frequency™ 55 Toric Contact Lenses (methafilcon B) Toric Soft Hydrophilic Contact Lenses for Daily and Extended Wear Vision Correction Part Number: PFG01017 Revision A Page 1 of 17 Revision Date: July 2016
Table of Contents Introduction ................................................................................................................................................................. 3 Description of the Lenses ........................................................................................................................................... 3 Lens Parameter Availability* ........................................................................................................................
Introduction The Frequency™ 55 Toric (Hydrophilic) Contact Lenses are high quality flexible wear contact lenses designed to fit the majority of patients easily, with good reproducibility, excellent vision and comfort. For a complete listing of available lens parameters, please refer to the Lens Description section. Description of the Lenses Frequency™ 55 Toric Contact Lenses resemble small scleral (haptic) lenses in that they overlap onto the sclera by about one millimeter.
* Call our Customer Service Department at (800) 341-2020 for current marketed parameters Actions When placed on the cornea, the hydrated Frequency™ 55 Toric Contact Lens acts as a refracting medium to focus light rays on the cornea. Indications Frequency™ 55 Toric Contact Lenses are indicated for daily and extended wear from 1 to 7 days between removals for cleaning and disinfecting as recommended by the eye care practitioner.
• If a patient experiences eye discomfort, excessive tearing, vision changes, or redness of the eye, the patient should be instructed to immediately remove lenses and promptly contact his or her eye care practitioner. Precautions Special Precautions for Eye Care Practitioners • Due to the small number of patients enrolled in clinical investigations of lenses, all refractive powers, design configurations, or lens parameters available in the lens material are not evaluated in significant numbers.
• • • • • • • • • • • Carefully follow the handling, insertion, removal, cleaning, disinfection, storing and wearing instructions in the Instructions for Wearers manual for the Frequency 55 Toric Contact Lenses and other instruction prescribed by the eye care practitioner. Never wear the lenses beyond the period recommended by the eye care practitioner. If aerosol products such as hairspray, are used while wearing lenses, exercise caution and keep eyes closed until the spray has settled.
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.
e. For both plus and minus lenses, the lens axis should be the same as the refractive axis. 2. Trial lens selection: a. Choose and 8.7 mm base curve lens when the flatter corneal curvature is no steeper than 44.00 diopters. An 8.4 mm base curve should be selected for when the flattest corneal curvature is steeper than 44.00. b. Place the lens on the patient’s eye and allow to equilibrate for 5-10 minutes. c. Check lens positioning.
Lens Positioning Perfect geometric centering of the lens is not always possible or necessary, and in some instances can only be achieved with a lens which is too tight. The important consideration in evaluating positioning is corneal coverage. If a lens is somewhat decentered, positioning is satisfactory when the entire cornea, including the corneal periphery opposite to the decentration, is completely covered by the lens. Instrumentation Slit Lamp a.
Occupational and environmental visual demands should be considered. If the patient requires critical vision (visual acuity and stereopis) it must be determined by trial whether this patient can function adequately with monovision. Monovision contact lens wear may not be optimal for such activities as: • Visually demanding situations such as operating potentially dangerous machinery or performing other potentially hazardous activities; and driving automobiles (e.g., driving at night).
3. Special Fitting Considerations Unilateral Lens Correction There are circumstances where only one contact lens is required. As an example, an emmetropic presbyopic patient would only require a near lens while a bilateral myope may require only a distance lens. Example: A presbyopic emmetropic patient who requires a +1.75 diopter add would have a +1.75 lens on the near eye and the other without a lens. A presbyopic patient requiring a +1.50 diopter add who is –2.50 diopters myopic in the right eye and –1.
the adaptational symptoms to the patient. These symptoms may last for a brief minute or for several weeks. The longer these symptoms persist, the poorer the prognosis for successful adaptation. To help in the adaptation process the patient can be advised to first use the lenses in a comfortable familiar environment such as in the home. Some patients feel that automobile driving performance may not be optimal during the adaptation process. This is particularly true when driving at night.
Wearing Schedule THE WEARING SCHEDULE SHOULD BE DETERMINED BY THE EYE CARE PRACTITIONER. Patients tend to overwear the lenses initially. It is important to adhere to the initial maximum wearing schedule. Patients should be cautioned to carefully follow the wearing schedule recommended by the eye care practitioner regardless of how comfortable the lenses feel.
• Check the lens surface, if there is accumulated debris, clean the lenses. Replace the lenses as soon as deposits develop which cannot be removed. e. Take keratometer readings of outside lens surface if best acuity through over-refraction is less than before. 3. Procedure for follow-up visits (with lenses removed) a. Do Slit Lamp examination of the cornea, both with and without fluorescein; check for edema, injection, vascularization and corneal staining. b.
• • • To store lenses, disinfect and leave them in the closed/unopened case until ready to wear. Lenses stored longer than 12 hours may require cleaning, rinsing and disinfecting again before use. The patient should consult the package insert or the eye care practitioner for information on storage of lenses. After removing the lenses from the lens case, empty and rinse the lens storage case with the solution recommended by the lens case manufacturer, then allow the lens case to air dry.
Because of the high water content, heat disinfection cannot be used with Frequency 55 Toric Contact Lens. A chemical disinfection system (not heat) must be used. The above table of recommended solutions is no exclusive. The selection of solutions best suited to the patient should be determined by the eye care practitioner. Chemical (Not Heat) Disinfection • Clean the contact lenses with a recommended cleaning solution and thoroughly rinse them with a recommended rinsing solution.
a soft state. Clean and disinfect the rehydrated lens according to the instructions accompanying the solutions. If after soaking, the lens does not become soft, DO NOT USE THE LENS. Care for a Sticking (Non-Moving) Lens If the lens sticks (stops moving) or begins to dry on the eye, apply three drops of the recommended lubricating or rewetting solution directly to the eye and wait until the lens begins to move freely on the eye before removing it.
