Ignite Creation Date:
2024-05-06 @ 8:08 PM
Last Modification Date:
2024-10-26 @ 3:22 PM
Study NCT ID:
NCT06278220
Status:
NOT_YET_RECRUITING
Last Update Posted:
2024-02-28
First Post:
2024-02-19
Brief Title:
Scheimpflug Versus Placido-disc System in Evaluation of Corneal Higher-Order Aberrations
Sponsor:
Assiut University
Organization:
Assiut University
Study Overview
Official Title:
Scheimpflug Versus Placido-disc System in Evaluation of Corneal Higher-Order Aberrations Before and After LASIK
Status:
NOT_YET_RECRUITING
Status Verified Date:
2024-02
Last Known Status:
None
Delayed Posting:
No
If Stopped, Why?:
Not Stopped
Has Expanded Access:
False
If Expanded Access, NCT#:
N/A
Has Expanded Access, NCT# Status:
N/A
Acronym:
None
Brief Summary:
Aim of work
To assess the agreement between placido-based topographer wavelight allegro topolyzer vario and scheimpflug -based Oculus Pentacam regard measuring corneal higher order aberrations before and after LASIK
To assess the agreement between placido-based topographer wavelight allegro topolyzer vario and scheimpflug -based Oculus Pentacam regard measuring corneal higher order aberrations before and after LASIK
Detailed Description:
Higher-order aberrations HOAs are small optical irregularities of the eye which can have an impact on the quality of the retinal image In contrast to lower order aberrations these errors cannot be corrected with regular spectacles and most contact lenses Additionally HOAs are responsible for an array of visual symptoms including dysphotopsia glare as well as a reduction in contrast sensitivity The cornea accounts for approximately 90 of ocular aberrationsAdvances and breakthroughs in wavefront aberration measurement technology can help clinicians to better understand and manage corneal higher-order aberrations HOAs especially for the preoperative planning of corneal refractive surgery and cataract surgeryA recent study has shown that corneal HOAs can be a sensitive parameter to differentiate early keratoconus from normal eyes Furthermore corneal aberrations have been widely used to evaluate dry eye and orthokeratologyLASIK surgery is widely used in the correction of refractive errors It is well known that LASIK surgery induces high-order aberrations HOA The main eye element involved in the generation of such aberrations is the first corneal surface Currently devices based on Placido-disc Hartmann- Shack ray tracing or Scheimpflug are routinely used in clinical aberration measurement Of which Pentacam is one of common instruments that can only measure corneal aberration including anterior and posterior corneal surface based on Scheimpflug technology Also Allegro Topolyzer is a Placido-based topographer that can measure anterior corneal higher order aberrations HOAs A better understanding of the agreement of device measurements can provide clinicians with useful information for measuring correcting and monitoring aberrations around refractive and cataract surgery Investigators therefore aimed to study the agreement between the two instruments in anterior corneal aberration measurement
Study Oversight
Has Oversight DMC:
None
Is a FDA Regulated Drug?:
False
Is a FDA Regulated Device?:
False
Is an Unapproved Device?:
None
Is a PPSD?:
None
Is a US Export?:
None
Is an FDA AA801 Violation?:
None