Alcon AquaComfort Plus handleiding

Handleiding

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pressure and return quickly to its original position.

4. Good comfort and stable visual response (with over-refraction)

Characteristics of a Tight (Steep) Lens Fit

A tight or steep lens t would display some or all of the following characteristics:

1. Insufcient or no lens movement during the blink in primary or

upgaze

2. Unsatisfactory Push-Up Test

•A tight tting lens will resist movement. If successfully nudged

upward, the lens may remain decentered or return slowly to its

original position.

3. Good centration

4. Good comfort

5. Fluctuating vision between blinks

Characteristics of a Loose (Flat) Lens Fit

A loose or at lens t would display some or all of the following

characteristics:

1. Reduced comfort, usually accompanied by lower lid sensation

2. Poor centration with limbal exposure on exaggerated eye movement

3. Lens edge standoff

4. Excessive lens movement during the blink in primary or upgaze

5. Unsatisfactory Push-Up Test

   • A loose tting lens will move easily but may remain decentered

or slip under the upper lid.

6. Vision may be blurred after the blink

An inverted lens will mimic the characteristics of a loose lens. If any of

the above signs occur remove the lens and check to make sure it is not

inverted.

General Fitting Tips

 • Whilehelpfulformonitoringcornealstabilityovertime,keratometryis

notareliablepredictorofbasecurve/trelationship.Trialttingofthe

individualeyeisstronglyrecommended.

 • Awell-ttinglenswillshowlessmovementthangenerallythought,0.1

to0.5mmisconsideredoptimal.

 • Aatbasecurve/cornearelationshipmayactuallyshowlimited

movement.Decentrationandexcessivelidsensationaccompanied

bylimitedmovementoftenindicatesthelensistooatforthegiven

eye.

Ifthecriteriaforawell-ttedlenscannotbeachieved,donotdispense.

C. Initial Lens Orientation Evaluation

No Rotation

When the scribe lines orient horizontally, the cylinder axis of the lens that is

dispensed or ordered should be the same as the spectacle refractive axis -

not the trial lens axis.

Contact lens cylinder axis = Spectacle refractive axis

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