The Influence of Different Preoperative Decision Schemes on the Visual Quality After Toric Intraocular Lens Implantation

Study Overview
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Brief Summary
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To study the Influence of Different Preoperative Decision Schemes on the Visual Quality After Toric Intraocular Lens Implantation

Official Title
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The Influence of Different Preoperative Decision Schemes on the Visual Quality After Toric Intraocular Lens Implantation

Conditions
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Recruitment of Participants

Intervention / Treatment
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* Procedure: phacoemulsification and Toric intraocular lens implantation


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Age-related cataract (age 55-80) Corneal astigmatism is greater than 1.0D Patients who are willing to implant Toric IOL Exclusion Criteria: Previous or present eye diseases, such as glaucoma, eye trauma, etc High refractive error Previous eye surgery Irregular astigmatism of the cornea

Ages Eligible for Study
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Minimum Age: 55 Years
Maximum Age: 80 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Minimal residual theoretical astigmatism group<br> | Procedure: phacoemulsification and Toric intraocular lens implantation<br>* A clear corneal incision is made in a different position<br>|
| Active Comparator: Steep meridian incision design group<br> | Procedure: phacoemulsification and Toric intraocular lens implantation<br>* A clear corneal incision is made in a different position<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Actual residual astigmatism after surgery | The actual residual astigmatism value after the operation is measured with the phoropter | 1 week postoperation | 
| Actual residual astigmatism after surgery | The actual residual astigmatism value after the operation is measured with the phoropter | 1 month postoperation | 
| Actual residual astigmatism after surgery | The actual residual astigmatism value after the operation is measured with the phoropter | 3 month postoperation | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| uncorrected distance visual acuity (UDVA) | uncorrected distance visual acuity (UDVA) is observed in each group | 1 week postoperation | 
| uncorrected distance visual acuity (UDVA) | uncorrected distance visual acuity (UDVA) is observed in each group | 1 month postoperation | 
| uncorrected distance visual acuity (UDVA) | uncorrected distance visual acuity (UDVA) is observed in each group | 3 month postoperation | 
| Theoretical residual astigmatism after surgery | The theoretical residual astigmatism is obtained by TECNIS Toric online calculator | 1 week postoperation | 
| Theoretical residual astigmatism after surgery | The theoretical residual astigmatism is obtained by TECNIS Toric online calculator | 1 month postoperation | 
| Theoretical residual astigmatism after surgery | The theoretical residual astigmatism is obtained by TECNIS Toric online calculator | 3 month postoperation | 
| Postoperative Totic intraocular lens rotation angle | Postoperative Totic intraocular lens rotation angle is observed in each group | 1 week postoperation | 
| Postoperative Totic intraocular lens rotation angle | Postoperative Totic intraocular lens rotation angle is observed in each group | 1 month postoperation | 
| Postoperative Totic intraocular lens rotation angle | Postoperative Totic intraocular lens rotation angle is observed in each group | 3 month postoperation | 
| Postoperative astigmatism and astigmatism axial of cornea | Postoperative astigmatism and astigmatism axial of cornea are measured with Pentacam | 1 week postoperation | 
| Postoperative astigmatism and astigmatism axial of cornea | Postoperative astigmatism and astigmatism axial of cornea are measured with Pentacam | 1 month postoperation | 
| Postoperative astigmatism and astigmatism axial of cornea | Postoperative astigmatism and astigmatism axial of cornea are measured with Pentacam | 3 month postoperation | 
| Corneal Aberrations | Corneal aberrations are measured with OPD-Scan Ⅲ | 1 week postoperation | 
| Corneal Aberrations | Corneal aberrations are measured with OPD-Scan Ⅲ | 1 month postoperation | 
| Corneal Aberrations | Corneal aberrations are measured with OPD-Scan Ⅲ | 3 month postoperation |