Refractive Sx pre-op Flashcards

1
Q

Why do we look for refractive stability +/-0.50?

A

Look for undiagnosed keratoconus

Patient satisfaction

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2
Q

Is diabetes a contraindication to Rx surgery?

A

No.

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3
Q

How long must you leave RGPs out for prior to surgery?

A

at least 3 weeks or a week for every decade they have worn them

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4
Q

How long must soft lenses be out for?

A

at least 1 week

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5
Q

Is pupil size still important?

A

With femto-second flaps and larger ablations probably not.

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6
Q

What mesopic size pupil should be treated cautiously?

A

7mm

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7
Q

Total RMS of 0.4 with a 6mm pupil could indicate what?

A

undiagnosed keratoconus

crystalline lens changes

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8
Q

What sorts of pachymetry are there?

A

Ultrasound
Anterior segment OCT
Schiempflug imaging
Scanning slit on orbscan

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9
Q

What LASIK corneal stromal bed should you aim for?

A

250 microns

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10
Q

What post-lasek corneal thickness should you aim for?

A

350 microns

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11
Q

Which causes less dry eye, femto-second or manual keratome or LASEK

A

LASEK (least)
Femto (more superficial cut)
Microkeratome (worst)

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12
Q

What steepness of cornea should you avoid to prevent dry eye?

A

Shouldn’t be steeper than 48/9D

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13
Q

Azar looked at schirmer without anaesthesia pre-op - what did he find?

A

If pre-op greater than 20mm then normal tear film (TBUT> 10secs) at 9 months
If pre-op greater than 10mm then no significant dry eye symptoms albeit some

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