Night Driving After Trifocal Versus Monofocal IOL Implantation (TriIOL)

August 5, 2026 updated by: Jin Yang

Night-Driving Visual Quality and Visual Disturbances After Bilateral Trifocal Versus Monofocal Intraocular Lens Implantation: A Prospective Observational Cohort Study

This prospective observational cohort study will compare night-driving visual difficulty and visual disturbances after bilateral implantation of an Alcon trifocal intraocular lens or an Alcon monofocal intraocular lens in adults undergoing cataract surgery. The type of intraocular lens will be selected by each participant and the treating ophthalmologist as part of routine clinical care, and will not be assigned by the investigators.

Eligible participants must have a valid motor vehicle driving license and a stable history of night driving during the previous 3 months. The primary outcome will be the total score of the Visual Function and Night Driving Questionnaire (VND-Q) at 3 months postoperatively. Secondary assessments will include glare adaptation, self-rated night-driving quality and driving speed, changes in night-driving behavior, visual disturbances, distance, intermediate and near visual acuity, contrast sensitivity, whole-eye aberrations, pupil diameter, defocus performance, reading speed, spectacle independence, and participant satisfaction.

Study Overview

Status

Not yet recruiting

Conditions

Intervention / Treatment

Study Type

Observational

Enrollment (Estimated)

200

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact Backup

Study Locations

  • China
    • Shanghai Municipality
      • Shanghai, Shanghai Municipality, China, 200000
        • Eye and ENT Hospital of Fudan University
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Sampling Method

Non-Probability Sample

Study Population

Adults aged 18 to 85 years with bilateral cataract who are scheduled to undergo bilateral phacoemulsification and in-the-bag implantation of either the same model of Alcon trifocal intraocular lens in both eyes or the same model of Alcon monofocal intraocular lens in both eyes. Participants must have a valid driving license and a stable history of night driving during the 3 months before enrollment.

Description

Inclusion Criteria:

  • Adults aged 18 to 85 years.
  • Scheduled to undergo bilateral phacoemulsification with in-the-bag intraocular lens implantation.
  • Both eyes scheduled to receive the same type and model of either an Alcon trifocal intraocular lens or an Alcon monofocal intraocular lens.
  • Possession of a valid motor vehicle driving license.
  • Stable night-driving behavior during the previous 3 months, with night driving occurring at least twice per month.
  • Lens Opacities Classification System III nuclear opalescence grade of 4 or lower in both eyes.
  • Expected intraocular lens power between +10.0 D and +36.0 D, inclusive, in both eyes.
  • Ability to understand the purpose and procedures of the study and independently complete the VND-Q and visual quality questionnaires.
  • Willingness to provide written informed consent and complete the scheduled postoperative follow-up visits.

Exclusion Criteria:

  • Corneal endothelial cell density below 1,500 cells/mm² in either eye.
  • History of ocular trauma affecting visual function, previous intraocular surgery, or previous corneal refractive surgery in either eye.
  • Strabismus, amblyopia, or nystagmus in either eye.
  • Any ocular disease that may affect postoperative visual acuity, contrast sensitivity, mesopic visual function, or questionnaire assessment, including but not limited to irregular corneal astigmatism, corneal scar, corneal degeneration, keratoconus, keratitis, corneal dystrophy, uveitis, severe iris atrophy, intraoperative floppy iris syndrome, microphthalmos, macrophthalmos, color vision deficiency, active ocular inflammation, advanced glaucoma or uncontrolled intraocular pressure, macular disease, retinal pigment epithelial disease, diabetic retinopathy, retinal detachment, choroidal detachment, or optic atrophy.
  • A high risk of zonular rupture or an contraindication to in-the-bag intraocular lens implantation, including zonular weakness, zonular dialysis, lens subluxation or dislocation, pseudoexfoliation syndrome, Marfan syndrome, posterior capsule rupture, or cyclodialysis.

Severe or unstable systemic disease, including systemic lupus erythematosus or Sjögren syndrome.

  • Use of medication judged by the investigator to increase surgical risk or affect visual function, including amiodarone, chlorpromazine, ethambutol, digitalis, or chloroquine.
  • Requirement for a combined ocular procedure, including limbal relaxing incisions, intraocular drug injection, retinal laser treatment, or another combined procedure judged inappropriate by the investigator.
  • Severe anxiety, depression, or another significant psychiatric disorder.
  • Any other condition judged by the investigator to make participation inappropriate.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort
Intervention / Treatment
Trifocal IOL Group
Undergo bilateral phacoemulsification and implantation of Alcon trifocal intraocular lens in both eyes
Device: AcrySof IQ PanOptix TFNT00 Trifocal Intraocular Lens
AcrySof IQ PanOptix TFNT00 Trifocal Intraocular Lens
Monofocal IOL Group
Undergo bilateral phacoemulsification and implantation of Alcon monofocal intraocular lens in both eyes
Device: Alcon Monofocal Intraocular Lens
Alcon Monofocal Intraocular Lens

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
VND-Q Total Score at 3 Months After Surgery
Time Frame: 3 months after the second-eye surgery
The Visual Function and Night Driving Questionnaire (VND-Q) consists of 9 items. Each item is rated on a 5-point Likert scale from 1, indicating no difficulty, to 5, indicating extreme difficulty. The total score ranges from 9 to 45, with higher scores indicating greater subjective difficulty during night driving.
3 months after the second-eye surgery

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Glare Adaptation Item Score of the VND-Q
Time Frame: 3 months after the second-eye surgery
Score of the VND-Q item assessing difficulty adapting to glare from oncoming vehicle headlights. A higher score indicates greater difficulty with glare adaptation.
3 months after the second-eye surgery
Self-Rated Night-Driving Quality
Time Frame: Baseline and 3 months after the second-eye surgery
Participant-reported night-driving quality assessed using a study-specific 5-point rating scale. Higher or lower scores will be interpreted according to the predefined questionnaire scoring system.
Baseline and 3 months after the second-eye surgery
Self-Rated Night-Driving Speed
Time Frame: Baseline and 3 months after the second-eye surgery
Participant-reported assessment of usual night-driving speed using a study-specific 5-point rating scale.
Baseline and 3 months after the second-eye surgery
Percentage of Participants Who Reduce Night Driving
Time Frame: 3 months after the second-eye surgery
The number and percentage of participants reporting that they reduced their night-driving frequency after surgery, based on a binary yes-or-no questionnaire item.
3 months after the second-eye surgery
Distance, Intermediate, and Near Visual Acuity
Time Frame: Baseline and 3 months after the second-eye surgery
Uncorrected distance visual acuity, uncorrected intermediate visual acuity, uncorrected near visual acuity, corrected distance visual acuity, distance-corrected intermediate visual acuity, and distance-corrected near visual acuity will be measured using logarithm of the minimum angle of resolution units. Testing distances will be 4 m for distance, 60 cm for intermediate, and 40 cm for near vision.
Baseline and 3 months after the second-eye surgery
Whole-Eye Aberrations
Time Frame: Baseline and 3 months after the second-eye surgery
Whole-eye optical aberrations measured using the same wavefront aberrometry device and standardized testing parameters for all participants.
Baseline and 3 months after the second-eye surgery
Visual Disturbance Questionnaire Score
Time Frame: Baseline and 3 months after the second-eye surgery
Participant-reported frequency or severity of glare, halos, starbursts, and other visual disturbances assessed using a standardized visual quality questionnaire.
Baseline and 3 months after the second-eye surgery

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Jin Yang

Investigators

  • Principal Investigator: Jin Yang, Fudan University

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

August 30, 2026

Primary Completion (Estimated)

August 30, 2031

Study Completion (Estimated)

August 31, 2031

Study Registration Dates

First Submitted

August 5, 2026

First Submitted That Met QC Criteria

August 5, 2026

First Posted (Actual)

August 10, 2026

Study Record Updates

Last Update Posted (Actual)

August 10, 2026

Last Update Submitted That Met QC Criteria

August 5, 2026

Last Verified

August 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • TriIOL-2026

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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