Clinical trial Recruiting at 1 site Interventional Ages 18 and up

Comparing corneal clarity and thickness after two cataract surgery systems

Official title: Unity VCS: A Comparison Study Evaluating Corneal Clarity and Thickness at Day 1 and Day 8 Post Op

Run by Metrolina Eye Associates, PLLC · NCT07222150 · Data updated 2026-11-12

This test will see if using a lower eye pressure with the Unity system during cataract surgery leads to fewer side effects and quicker vision recovery than using a higher pressure with the Centurion system for people having cataract surgery.

Quick facts

Study typeInterventional
Ages18 Years and up
SexAll
Enrollment105 (estimated)
SponsorMetrolina Eye Associates, PLLC
Academic / other
Locations1 site (Matthews, North Carolina)
StatusRecruiting
StartedOctober 7, 2025
Main results expectedApril 2026
Study endsOctober 2026
Registry record updatedOctober 29, 2025
Trial IDNCT07222150 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are adults with cataracts in both eyes of similar severity who do not have glaucoma or corneal disease and can attend the study site for both surgeries and follow‑up.

Probably not a fit

Patients with glaucoma, pre‑existing corneal disease, or those having only one‑eye surgery are unlikely to benefit or be eligible for this comparison.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

Each participant will have sequential bilateral phacoemulsification with similar cataract grades in both eyes, with surgeries completed within about one week. The order of the first surgical eye is randomized; one eye is operated on with the Alcon Unity VCS at a lower intraocular pressure setting (<40) and the fellow eye with the Alcon Centurion VCS with Ozil at a higher pressure setting (≥60). Both devices are FDA‑approved and will be used according to their labels. Outcomes include corneal clarity, corneal thickness, and early visual recovery, with follow‑up lasting about one month.

Why it matters

Potential benefit: If successful, the lower intraoperative pressure setting with the Unity system could reduce corneal swelling and help patients regain clearer vision sooner after surgery.

How similar studies have gone: Some prior studies suggest lower intraoperative pressures may reduce corneal endothelial stress, but direct head‑to‑head comparisons of these exact systems and settings are limited.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Cataracts

Exclusion Criteria:

* Glaucoma, cornea disease

Where it's running

  • Metrolina Eye Associates
    Matthews, North Carolina, United States
    Recruiting

Study contacts

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How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
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Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.