- Photo-disruption
- Photoablation is lASIK

Femtosecond laser is what type of laser reaction

OQ Refractive

Where does the pupil shift to when constricted in bright lights?

- alloplastic corneal inlay
- Porous ring segements used in nondominant eyes for presbyopic correction
- small aperature causes increased DOF

- 3 days for soft non toric
- 2 weeks for toric
- 2-3 weeks for RGP

How long to be out of contact lenses before refractive surgery?

- Antihistamines
- Sumatriptan
- Hormone replacement
- Isoretinoin - permanent destruction of meibomian glands

Delayed epithelial healing from which systemic meds?

- Reduce keratocyte population
- keratocytes lay down collagen and GAGs - resulting in more post-operative scarring and haze

Mechanism of action for mitomycin C (MMC)

Zero order = piston
1st order = vertical and horizontal prism
2nd order = myopia (positive defocus) and hyperopia (negative defocus) 
3rd order = coma, spherical aberration, trefoil

- Photothermal: Holmium:YAG laser - laser thermokeratoplasty (LTK). Used to treat low hyperopia
- Photoablation: excimer lasers: breaks carbon-carbon bonds. Most common is argon-fluoride lasers 
- Photodisruption: turns corneal surface into plasma. Femtosecond and Nd:YAG lasers are photodisruptive.

- Full thickness undulating stromal folds - visually significant
- can lead to flap dislocation/slippage and resultant gutter in area of flap by the folds. 
- Make sure patient doesn&#039;t squeeze eyes or rub eye during first days post-op 
- visually-significant slipped fat or macrostraie must be refloated ASAP. smoothing it out gives best long term prognosis. Life and irrigate under flap. 
- If &gt;24 hrs of macrostriae, epithelium needs to be removed overcentral 6mm prior to refloat. Then BCL is used to stabilize.

What are macrostriae immediately post-operative?

- poor wound healing of K epithelium - more PEE and epi defects.

Most common problem with LASIK in diabetics

Study with Quizlet and memorize flashcards containing terms like Femtosecond laser is what type of laser reaction, Where does the pupil shift to when constricted in bright lights?, What is Kamra Inlay or AcuFocus and more.

OQ Refractive Flashcards

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