Which reading glasses give the best view? new study puts three lens designs to the test
NCT ID NCT07617090
First seen Jun 26, 2026 · Last updated Jun 27, 2026 · Updated 1 time
Summary
This study compares three types of progressive lenses to see which provides the widest clear vision at distances from 4 meters down to 25 centimeters. About 26 presbyopic participants will test each lens in a random, double-blind order. The goal is to help eye doctors choose the best lens for people who need sharp vision at both arm's length and close up.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- progressive addition lenses (PALs)
- What this could lead to
- If successful, this study could help eye doctors recommend the best lens design for people who need clear vision at arm's length and close up.
- What could go wrong
- This is a small, early-stage study with only 26 participants, so results may not apply to everyone. The main risk is temporary eye strain from testing.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Phase
-
Not a phased trial
Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.
- Participants
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26 people
The number who actually took part.
- Started
-
Sep 2025
- Expected to finish
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Sep 2026
An estimate. End dates often move.
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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52 to 67 years
- Sex
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Anyone
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
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Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
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.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
-
Pharmacy school, University of Seville
Seville, Sevilla, 41012, Spain
More trials for these conditions
Other studies related to the condition(s) this trial covers.
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