Ignite Creation Date:
2024-10-26 @ 3:35 PM
Last Modification Date:
2024-10-26 @ 3:35 PM
Study NCT ID:
NCT06505434
Status:
NOT_YET_RECRUITING
Last Update Posted:
None
First Post:
2024-07-11
Brief Title:
A Dynamic Study of Pupil Diameter After Artificial Lens Implantation in Patients With High Myopia
Sponsor:
None
Organization:
None
Study Overview
Official Title:
A Dynamic Study of Pupil Diameter After Artificial Lens Implantation in Patients With High Myopia
Status:
NOT_YET_RECRUITING
Status Verified Date:
2024-07
Last Known Status:
None
Delayed Posting:
No
If Stopped, Why?:
Not Stopped
Has Expanded Access:
No
If Expanded Access, NCT#:
N/A
Has Expanded Access, NCT# Status:
N/A
Acronym:
None
Brief Summary:
Age-related cataract remains the leading cause of blindness in developing countries And with the aging of the population in these countries the number of cataract patients will continue to grow With accurate biological measurements and the implantation of appropriate IOLs most cataract patients can achieve good distance vision after surgery However it should not be overlooked that the current global prevalence of myopia is over 283 and is expected to reach 498 by 2050 while the rate of high myopia will increase from the current 40 to 98 The prevalence of cataracts is significantly higher in the highly myopic population than in the orthoptic population
The pupil is an important factor to be evaluated during the selection of an artificial lens Intraocular lens IOL especially a functional IOL It has been shown that the diameter and sensitivity of the pupil in patients with high myopia are also significantly different from those in the orthopneic population and that there is a correlation with the adjustment status and refractive error The purpose of this study is to investigate the following 1 Whether the change of refractive status before and after IOL implantation in highly myopic cataract patients will lead to the change of pupil physiological characteristics and whether the modification of preoperative measurement parameters can expand the population of myopic patients who can be reasonably applied to the functional IOL and obtain a high degree of satisfaction from patients 2 Pupil diameter under a single fixed light source is a rough assessment for the screening of the population for functional IOLs and this study was conducted in a single fixed light source In this study we measured the maximum value of pupil diameter minimum value of pupil diameter and rate of change of pupil diameter under bright vision and dark vision and analyzed the correlation between the above three parameters and visual quality to further optimize the objective index of pupil diameter for the screening of functional IOL applicants
Objectives of the study
1 To observe the dynamic changes of pupil diameter and its visual quality before and after lens extraction combined with IOL implantation in myopic patients and to analyze the correlation between the changes of pupil diameter and visual quality
2 To explore the patterns of refractive error and pupil biometric changes in myopic patients before and after IOL implantation and to make corrections for the evaluation of preoperative biometric indexes for reference
The pupil is an important factor to be evaluated during the selection of an artificial lens Intraocular lens IOL especially a functional IOL It has been shown that the diameter and sensitivity of the pupil in patients with high myopia are also significantly different from those in the orthopneic population and that there is a correlation with the adjustment status and refractive error The purpose of this study is to investigate the following 1 Whether the change of refractive status before and after IOL implantation in highly myopic cataract patients will lead to the change of pupil physiological characteristics and whether the modification of preoperative measurement parameters can expand the population of myopic patients who can be reasonably applied to the functional IOL and obtain a high degree of satisfaction from patients 2 Pupil diameter under a single fixed light source is a rough assessment for the screening of the population for functional IOLs and this study was conducted in a single fixed light source In this study we measured the maximum value of pupil diameter minimum value of pupil diameter and rate of change of pupil diameter under bright vision and dark vision and analyzed the correlation between the above three parameters and visual quality to further optimize the objective index of pupil diameter for the screening of functional IOL applicants
Objectives of the study
1 To observe the dynamic changes of pupil diameter and its visual quality before and after lens extraction combined with IOL implantation in myopic patients and to analyze the correlation between the changes of pupil diameter and visual quality
2 To explore the patterns of refractive error and pupil biometric changes in myopic patients before and after IOL implantation and to make corrections for the evaluation of preoperative biometric indexes for reference
Detailed Description:
None
Study Oversight
Has Oversight DMC:
None
Is a FDA Regulated Drug?:
None
Is a FDA Regulated Device?:
None
Is an Unapproved Device?:
None
Is a PPSD?:
None
Is a US Export?:
None
Is an FDA AA801 Violation?:
None