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Clinical Trial Details — Status: Completed

Administrative data

NCT number NCT03597906
Other study ID # N-18-2018
Secondary ID
Status Completed
Phase N/A
First received
Last updated
Start date August 15, 2018
Est. completion date January 20, 2020

Study information

Verified date January 2020
Source Cairo University
Contact n/a
Is FDA regulated No
Health authority
Study type Interventional

Clinical Trial Summary

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.


Description:

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


Recruitment information / eligibility

Status Completed
Enrollment 30
Est. completion date January 20, 2020
Est. primary completion date November 15, 2019
Accepts healthy volunteers Accepts Healthy Volunteers
Gender All
Age group 18 Years and older
Eligibility Inclusion Criteria:

- Stable refractive error: Myopic astigmatism = -1.5 D

- Valid Topolyzer maps (at least four out of eight right maps with green analyzed area and the registration box is green).

Exclusion Criteria:

1. Estimated postoperative residual stromal bed thickness of less than 300µm.

2. Glaucomatous patients.

3. Patients with keratoconus.

4. Patients with pervious refractive surgery.

5. History of previous ocular trauma or surgery.

6. History of recent herpetic ulcer or viral keratitis.

7. Basement membrane disease, history of recurrent corneal erosions.

8. Sicca syndrome, dry eye.

Study Design


Related Conditions & MeSH terms


Intervention

Procedure:
topography guided ablation
using the data obtained from the topolyzer for correction of refractive errors specially astigmatism we use 3 different treatment protocols
manifest refraction
using for ablation the exact manifest refraction
full topography modified refraction
full topography modified refraction means changing both sphere and cylinder power in the ablation profile
partial topography modified refraction
partial topography modified refraction means changing only cylinder power and axis in the ablation profile

Locations

Country Name City State
Egypt Kasr Alainy Cairo

Sponsors (1)

Lead Sponsor Collaborator
Cairo University

Country where clinical trial is conducted

Egypt, 

Outcome

Type Measure Description Time frame Safety issue
Primary post operative residual astigmatism measuring the post operative residual astigmatism and comparison between the 3 group to reach to the most accurate protocol. 3 months
Secondary measurement of the postoperative unaided visual acuity measurement of the postoperative unaided visual acuity and comparison between the 3 group to reach to the most accurate protocol. 3 months
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