Volumetric visual fields with occupational vs general-purpose progressive lenses in presbyopia

Is this trial a fit for you?

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

What this trial studies

This is a single-center, randomized, double-blind, crossover trial that compares how much clear vision is available at different working distances when using two occupational progressive lenses (OPLs) designed for intermediate and near vision and a general-purpose progressive lens. Participants undergo standard optometric assessments and then have visual field measurements with each lens under controlled conditions. The study uses a fixed sequence and blinded evaluation to determine differences in volumetric visual fields across lenses. Outcomes focus on the extent of clear vision across distance ranges, not just acuity at a single distance.

Why it matters

Who can join: the full rules

Inclusion Criteria:

* • Spherical ametropia for distance vision ≤ ±4.00 D and astigmatic ametropia ≤ 1.00 D.

  * Decimal VA ≥ 0.8, either uncorrected (UCVA) or corrected (BCVA) with monofocal contact lenses.
  * Patients with a nasopupillary distance (NPD) of 31 mm, with a tolerance of ±2 mm in each eye

Exclusion Criteria:

* Astigmatism greater than ±1.00 D.
* Patients wearing progressive contact lenses.
* Patients who have undergone cataract surgery or have monofocal or multifocal intraocular lenses.
* Anisometropia greater than 2.50 D.
* Decimal distance visual acuity \< 0.8 (UCVA or BCVA) with monofocal contact lenses.

Where it's running

• Pharmacy School, University of Seville
  Seville, Andalusia, Spain Recruiting

Study contacts

• Principal investigator: José Manuel Serrano Morales, PhD — Pharmacy School, University of Seville
• Study coordinator: José Manuel Serrano Morales, PhD
• Email: jsmorales@us.es
• Phone: 0034654686850

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

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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.