Volumetric visual fields with progressive lenses for presbyopia at intermediate and near distances

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 comparing two occupational progressive lenses designed for intermediate and near vision in presbyopic adults. Participants will undergo a series of optometric evaluations and visual field assessments while wearing each lens type, with a fixed head position during testing. The study uses plano distance power and a +2.00 D near addition to measure differences in the extent and depth of clear vision across multiple working distances. Outcomes focus on volumetric visual fields and how they vary between lens options under standardized conditions.

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.
* Patients without normal ocular motility or with partial dysfunction of one or more ex-traocular muscles, or with restricted visual fields or scotomas.
* Visual suppression in one eye between 4 m and 25 cm.
* Strabismus or nystagmus.

Where it's running

• Phaculty of Pharmacy, University of Seville
  Seville, Andalusia, Spain Recruiting
• Pharmacy school, University of Seville
  Seville, Sevilla, Spain Active not recruiting

Study contacts

• Study coordinator: José Manuel Serrano Morales, Pharmacy and Optometry, 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.