LASIK REFRACTIVE SURGERY DEMYSTIFIED
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Transcript of LASIK REFRACTIVE SURGERY DEMYSTIFIED
LASIK DEMYSTIFIEDPRK REVISITED
INDOREDRISHTI.WORDPRESS.COM
DR DINESH MITTAL DR SONALEE MITTAL
DRISHTI EYE HOSP VIJAYNAGAR INDORE
Eye’s refractive power determined by 1. Power of the cornea 2. Power of the lens 3. Length of the eye
EMMETROPIA - IMAGE OF THE OBJECT BEING VIEWED IS FOCUSED ON RETINA
1. Myopia - Near-
sightedness- Image is focused
in front of retina2. Hyperopia - Far-sightedness- Image is focused
behind retina
LASIK (Laser-assisted in situ keratomileusis)
•Most commonly performed refractive surgery• Excimer laser ablation of corneal stroma beneath a hinged corneal flap created with a mechanical microkeratome / femtosecond laser
LASIK STEPS
TOPICAL ANAESTHESIA
SUCTION RING
MICROKERATOME HEAD
EXCIMER LASER FLAPFLAP PUT BACK
NEW CURVATURE
LASIK
ADVANCED SURFACE ABLATIONS
REMOVAL OF EPITHELIUMSPATULA
⓴% ALCHOL
ROTARY BRUSH
MUNNERLYN FORMULA
PERCENT TISSUE ALTERED PTA
PTA SHOULD BE LESS THAN 40 %
COMPLICATIONCOMPLICATION LASIK ASAECTASIA ***** *
FLAP RELATED ***** NO
HAZE * ***
DRY EYE ** *INFECTIONS * **INFLAMMATORY *** *IRREGULAR ASTIGMATISM
* *
WHICH PROCEDURE
WHICH PROCEDURE
SCREENINGALGORITHM
Refractive surgery trends
lasik
lasik
PREOP TESTING
EVALUATION
INDICATIONS
EXAMINATION
EQUIPMENT
TOPOGRAPHIC ANALYSIS Keratometry & Computerized Videokeratography
PACHYMETRY measuring thickness of cornea
ULTRASONIC PACHYMETRYMinimum bed
thickness (275µ)
TOP ❿ RED FLAGS
screening
consultation
OCULAR DISEASE
Visually demanding occupations
Inappropriate expectations
All corneal refractive surgical procedures reduce corneal strength to varying degrees
Excessive corneal weakening can result in nonprogressive irregular astigmatism or progressive corneal ectasia
ECTASIA RISK SCORE SYSTEM
TO BE CONTINUED IN PART 2
LASIK DEMYSTIFIEDPRK REVISITED
INDOREDRISHTI.WORDPRESS.COMPART 2
DR DINESH MITTAL DR SONALEE MITTAL
DRISHTI EYE HOSP VIJAYNAGAR INDORE
TOMOGRAPHY
THANKS TO MAZEN M SINZAB
TOMOGRAPHY• ANTERIOR CURVATURE ( TOPOGRAPHY )• ANT. & POST. CORNEAL
SURFACE ELEVATION DATA• REGIONAL CORNEAL
THICKNESS• BELIN / AMBROSIO DISPLAY FOR
EARLY DETECTION OF ECTASIA
PENTACAM GOLD STANDARD GIVE ALL ABOVE DATA
Topography pattern categories
pentacam
BFS>8 ANT ; >18 POST
DECISION
PRK
NO RISK DO PRK OR LASIK
K READINGS
K READINGS
K READINGS
K READINGS
K READINGS
K READINGS
K READINGS
K READINGS effect on flap properties
TO BE CONTINUED IN PART 3
LASIK DEMYSTIFIEDPRK REVISITED
INDOREDRISHTI.WORDPRESS.COMPART 3
DR DINESH MITTAL DR SONALEE MITTAL
DRISHTI EYE HOSP VIJAYNAGAR INDORE
THANK YOUDR DINESHDR SONALEE