Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile

Summary

This article provides a step-by-step guide to correcting presbyopia with a monocular bi-aspheric ablation profile.

Abstract

The study aims to evaluate visual acuity and objective visual quality before and after the monocular bi-aspheric ablation profile for correction of presbyopia surgery. This prospective self-control study included 20 cases and 38 eyes of patients who underwent monocular bi-aspheric ablation profile correction of myopia with presbyopia at the Eye Hospital of Shandong University of Traditional Chinese Medicine from January 2023 to January 2024. These patients were selected for observation, and each patient's preoperative and postoperative uncorrected distance visual acuity (UDVA), uncorrected near visual acuity (UNVA), corrected distance visual acuity (CDVA), spherical aberration (SA) (within 6 mm), horizontal and vertical coma (within 6 mm), and corneal aspheric index (Q-value) (within 6 mm) were evaluated. Statistical data analysis was performed at different time points before and after the operation. There were statistically significant differences in UDVA between dominant and non-dominant eyes before and after surgery (Z = -3.784, p < 0.001; Z = -3.817, p < 0.001). Post-operatively, 90% of the non-dominant eyes achieved UNVA of J1 and above, and 95% of the bilateral eyes achieved UNVA of J1 and above. Significant differences were found in the SA of the dominant eyes, which showed a positive increase (Z= -3.784, p < 0.001); however, compared with the dominant eye, the SA of the non-dominant eye was negatively increased, but the difference was not statistically significant (p = 0.08). There was a significant difference in the vertical coma of the dominant eye before and after the operation, but there was no significant difference in non-dominant eyes. There was no significant difference in the change of binocular horizontal coma before and after the operation. There were significant changes in the Q value of both eyes before and after the operation (Z = -3.923, p < 0.001; Z = -3.51, p < 0.001). After the monocular bi-aspheric ablation profile, the cornea of the non-dominant eye showed a prolate shape, negative SA increased, and the UDVA and UNVA improved after the operation.

Introduction

Presbyopia is an age-related reduction in amplitude of accommodation leading to loss of near vision due to the loss of function of the lens and ciliary muscle¹. The global population of presbyopes is projected to exceed 2 billion by 2030, with uncorrected and undercorrected presbyopia affecting socio-economic development². Correction of presbyopia includes lens correction, surgical approaches, and medication. Corneal surgery is one of the main forms of corneal surgery to correct presbyopia because of its less invasive nature, fewer complications, and faster recovery³.

R....

Protocol

The following protocol was reviewed and approved by the Ethics Committee of the Affiliated Eye Hospital of Shandong University of Traditional Chinese Medicine (Grant No. HEC-KS-2020002KY), and was strictly adhered to the Declaration of Helsinki. All patients signed an informed consent form.

1. Patient selection

NOTE: 20 patients (38 eyes) with presbyopia treated by excimer laser monocular multifocal bi-aspheric ablation were admitted to the Department.......

Discussion

Currently, there are limited effective methods for restoring ocular accommodation, making presbyopia a prominent area of research in refractive surgery. The bi-aspheric ablation profile, a widely recognized clinical modality for presbyopia correction, has shown favorable safety and efficacy with satisfactory postoperative outcomes^15,16,17. However, there is a paucity of studies focusing on the monocular mode. In this study, we p.......

Materials

Name	Company	Catalog Number	Comments
0.9% Sodium Chloride Physiological Solution	Shandong Qidu Pharmaceutical Co., Ltd.	H37020764
AMARIS 1050RS Excimer Laser System	SCHWIND eye-tech-solutions,DE	https://www.eye-tech-solutions.com/amaris1050-excimer-laser
Compound Electrolyte Intraocular Irrigating Solution	Shenyang Xingqi Ophthalmic Co.	http://sinqi.com/html/SYXQ/202006/948671948671019061.html
Dexamethasone Eye Drops	Alcon-Couvreur	H20150119
Dextran 70	Chengdu Qingshan Likang Pharmaceutical Co.	6941684920076
Glycerol Eye Drops	Chengdu Qingshan Likang Pharmaceutical Co.	6941684920076
Hypromellose 2910	Chengdu Qingshan Likang Pharmaceutical Co.	6941684920076
Levofloxacin Hydrochloride Eye Drops	Shandong Bausch & Lomb Freda Pharmaceutical Co., Ltd	6924090700180
Proparacaine hydrochloride Eye Drops	Alcon-Couvreur	H20103352
SCHWIND Cutom Ablation Manager for Amaris	Consorzio Servizi Ortopedici,Turin,IT	N/A
Sirius 3D anterior segment and corneal aberration analyzer	Consorzio Servizi Ortopedici,Turin,IT	YM0020207
Skin disinfectant	Jinan Xinyongtai Shiye Co., Ltd	http://www.sdxyt.cn/zh/products_detail.asp?id=23
Sterile Irrigator for Single Use	Shandong Weigao Group Medical Polymer CO.,Ltd	https://weigaogroup.com/photo/show-114.aspx
Sterile medical sponge for Single Use	Beijing Kang'an Kelin Technology Co., Ltd	SS-96A
Tobramycin Eye Drops	Alcon-Couvreur	H20150119
Transparent Film Dressing Frame Style	Minnesota Mining and Manufacturing	1624WCN
VisuMax femtosecond laser system	Carl Zeiss Meditec, Inc., Dublin, CA	20183241728