Refractive Surgery Clinical Trial
Official title:
Comparison of the Outcome of Topography Modified Refraction Correction to Standard Clinical Refraction Correction in Myopic Astigmatic Topography-guided LASIK
Background and Rationale:
LASIK has been among the highest satisfaction rates of surgical procedures, ranging from
82%-98%. Different ablation profiles have been developed over the years. The purpose of this
study is to validate this novel measurement by comparing the visual outcomes when the TMR is
used in myopic astigmatic LASIK to using the standard manifest refraction or the Topolyzer
measurements alone.
Objectives :
To evaluate the safety, efficacy and predictability of topography-guided myopic LASIK with
three different refraction treatment strategies.
Candidates for refractive surgery above 18 years with myopic astigmatism and no previous
ocular surgery.
Sample size 60 eyes. surgery:
- 60 eyes of myopic topography-guided LASIK procedures with the same refractive platform
(FS200 femtosecond to create a flap between90: 110 μm with diameter 8:9 mm and EX500
excimer lasers) will be randomized for treatment as follows:
- Group A: 20 eyes will be treated using Contoura vision with the standard manifest
refraction.
- Group B: 20 eyes will be treated with Contoura vision using the topographic astigmatic
power and axis and without change in the spherical power (using the same spherical power
as the manifest refraction).
- Group C [TMR]: 20 eyes will be treated with Contoura vision using the topographic
astigmatic power and axis and modifying the spherical power to obtain the same spherical
equivalent as the manifest refraction. This is done by subtracting half of the
difference between topographic astigmatic power and the manifest astigmatic power from
the spherical power (topography-modified treatment refraction).
- The standard postoperative treatment is combined steroids and antibiotics eye drops 5
times daily for one week ,then three times daily for three days and lubricant eye drops
5 times daily for six months.
Postoperatively, the patients will be examined at 1 week, 1 month and 3 months. All
postoperative follow-up visits included measurement of UDVA, CDVA (if indicated) and
refraction, besides full ophthalmological examination and performing pentacam and topolyzer
after 3 months
;
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