Alcon AquaComfort Plus handleiding

Handleiding

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2. PRE-FITTING EXAMINATION

A pre-tting examination is necessary to:

  • determine whether a patient is a suitable candidate for FOCUS

®

DAILIES

®

Progressives contact lenses

  • assess the patient’s motivation, physical state and willingness to

comply with instructions regarding hygiene and wear schedule

  • make ocular measurements for initial contact lens parameter

selection

  • collectbaselineclinicalinformationtowhichpost-ttingexamination

results can be compared

The pre-tting examination should include:

  • athoroughcasehistory

  • detailedassessmentofpatient’sindividualvisualdemands

  • understandingofpatient’sobjectivesforlenswearandexpectations

  • adistancespherocylindricalrefraction,nearadddeterminationand

measurement of pupil diameter

  • keratometry

  • tearlmassessment

  • biomicrosopy

3. TRIAL LENS EVALUATION

FOCUS

®

DAILIES

®

Progressives lenses are available in a single base curve/

diameter combination of 8.6/13.8 mm.

Note: A careful spherocylindrical maximum plus to best visual acuity refraction

(M+BVA) and nearpoint add determination should be conducted prior to

selecting trial lenses. Autorefraction ndings should be rened manually to

rule out effects of instrument myopia and ensure proper control of residual

accommodation.

A. Initial Lens Power Selection

The FOCUS

®

DAILIES

®

Progressives lens design makes selecting the

initial lens power easy. You need only manipulate the distance power. The

optimum starting point is with a power that is more plus or less minus than the

vertex corrected spherical equivalent spectacle refraction. Using the Power

Selection Table provided on the following pages will simplify the process of

initial lens selection.

Step 1. Convert the spectacle Rx to a spherical equivalent.

Spherical Equivalent = Sphere power + ½ (Cylinder Power)

 Step2.InthePowerSelectionTablelocatethesphericalequivalentfrom

step1ontheverticalaxis.Thereisnoneedtocorrectforvertex

distance.Thetablecompensatesfora13mmvertexdistance.

 Step3.Locatethespectacleaddpoweronthehorizontalaxis.

Step 4. The intersection of these 2 boxes is the initial trial lens power.

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