Tomographic Analysis of Anterior, Posterior, Total Corneal Refractive Power Changes After Laser-assisted Keratotomy

Tomographic Analysis of Anterior, Posterior and Total Corneal Refractive Power Changes After Femtosecond Laser-assisted Keratotomy After Laser Lens Surgery

Status

Completed

Phases

Unknown

Study type

Observational

Source

ClinicalTrials.gov

Registry ID

NCT03097302

Enrollment

Registered

2017-03-31

Start date

2013-06-06

Completion date

2014-07-31

Last updated

2017-03-31

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Corneal Astigmatism

Keywords

laser-assisted keratotomy, anterior astigmatism, posterior astigmatism, total corneal refractive power, nomogram

Brief summary

To analyze the effect of femtolaser-assisted keratotomy on corneal astigmatism (anterior, posterior and Total corneal refractive power) measured by Scheimpflug tomography after laser lens surgery.

Detailed description

This study investigated patients' eyes with low to moderate total corneal refractive power determined with Scheimpflug tomography (Pentacam HR) after penetrating femtosecond laser-assisted keratotomy (pFLAK) and laser lens surgery. The anterior corneal astigmatism, posterior corneal astigmatism and total corneal refractive power were determined before, 1 month and 3 months after lens surgery. Vector analysis according to the Alpins' method was used to calculate surgically induced astigmatism (SIA).

Interventions

PROCEDURELaser keratotomy

Penetrating femtosecond laser assisted keratotomy to treat preexisting corneal astigmatism during lens surgery.

Study design

Observational model

COHORT

Time perspective

PROSPECTIVE

Eligibility

Sex/Gender

ALL

Age

18 Years to No maximum

Inclusion criteria

\- Patients who received penetrating femtosecond laser-assisted lens surgery with low to moderate corneal astigmatism

Exclusion criteria

* Eyes with irregular corneal astigmatism such as keratoconus, previous corneal surgery, acute or chronic ophthalmic diseases of the anterior segment and intraoperative complications were not included in this study.

Design outcomes

Primary

Measure	Time frame	Description
Change from Baseline Total corneal refractive power at 3 months	Before and 3 months after lens surgery	Total corneal astigmatism (anterior and posterior astigmatism)

Secondary

Measure	Time frame	Description
Change from Baseline Anterior corneal astigmatism at 3 months	Before and 3 months after lens surgery	Anterior corneal astigmatism
Change from Baseline Posterior corneal astigmatism at 3 months	Before and 3 months after lens surgery	Posterior corneal astigmatism

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026