An interventional study of Eye exam and Questionnaires in Healthy Young Adults and Accommodation Disorder, sponsored by Essilor International. Not yet recruiting at 1 site in United Kingdom. Open to participants aged 18 Years to 35 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2026-10-06.
Sponsored by Essilor International · Not applicable, Interventional, and Supportive care
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This clinical study aims to understand how glasses with a small reading addition affect the way the eyes focus and work together in young adults with normal near vision.
Some people experience focusing difficulties or visual discomfort during near-vision activities such as reading or using digital devices. This study will evaluate whether glasses with a small reading addition can help reduce these difficulties and improve visual comfort.
Researchers will compare two different pairs of glasses designed to provide additional support for near vision. They will assess how each pair affects eye focusing and eye coordination using standard optometric examinations.
Participants will:
Essilor International is the lead sponsor of 38 studies on the registry; 20 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
A reason a treatment, test or procedure should not be given to a particular person, such as an allergy, another illness or a medicine they take.
The other ingredients in a medicine besides the active drug, such as fillers, colours or preservatives.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraindication
A reason a treatment, test or procedure should not be given to a particular person, such as an allergy, another illness or a medicine they take.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Excipients
The other ingredients in a medicine besides the active drug, such as fillers, colours or preservatives.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
The very first pair of lenses worn before the experimental arm are washout lenses : Standard single-vision spectacle lenses prescribed according to each participant's refractive error and worn during the washout period before allocation to the study lenses.
Device: Eye exam · Other: Questionnaires · Device: Washout lenses · Device: Reference lenses · Device: Test lenses
The very first pair of lenses worn before the experimental arm are washout lenses : Standard single-vision spectacle lenses prescribed according to each participant's refractive error and worn during the washout period before allocation to the study lenses.
Device: Eye exam · Other: Questionnaires · Device: Washout lenses · Device: Reference lenses · Device: Test lenses
An optometric eye exam
Questionnaires on the eye fatigue and the quality of vision
Standard single-vision spectacle lenses prescribed according to each participant's refractive error and worn during the washout period before allocation to the study lenses.
Also known as: Single Vision Stylis Cz Sapph
Spectacles lenses optimized near vision lenses for the comparator
Spectacles lenses optimized near vision lenses for the test
Accommodative facility difference
Measurement of the accommodative facility to understand the flexibility of the accommodation. It will be measured in cycle per minute (cpm) using a +/-2.00D flipper lens test at 40cm according to standard clinical accommodative facility testing procedures. Lenses are placed in front of the eyes to stimulated or not the accommodation on a text. The main goal of the participant is to keep clear and single the target while switching between the accommodative lenses and the non accommodative lenses. The results obtained after the wearing period of each lenses will be compared together.
Time frame: From enrollement to the end of the participation at about 16 weeks
Visual fatigue questionnaire score
Visual fatigue assessed using a validated questionnaire, CISS (Borsting et al, Optometry and Vision Science. 2003, 80(12):832-838). Total questionnaire scores (range 0 to 56 with a higher score meaning a higher fatigue) obtained after each lens-wear period will be compared between the reference lens and the test lens
Time frame: From enrollement to the end of the participation at about 16 weeks
Visual Comfort Questionnaire Score
Visual comfort assessed using a questionnaire administered at the end of each lens-wear period. Questionnaire scores (range from 0 to 182) will be compared between the reference lens and the test lens.
Time frame: From enrollement to the end of the participation at about 16 weeks
Vision Quality Questionnaire Score
Subjective quality of vision assessed using a questionnaire. Total questionnaire scores (range from 0 t o182) will be compared between the reference lens and the test lens.
Time frame: From enrollement to the end of the participation at about 16 weeks
Participant Lens Preference
Participant preference for the reference lens or the test lens assessed at the completion of both lens-wear periods using a preference questionnaire.
Time frame: From enrollement to the end of the participation at about 16 weeks
Near Phoria
Near phoria (in prismatic diopter) measured using standard clinical procedures. Phoria values obtained after participants wore the reference lens and the test lens will be compared.
Time frame: From enrollement to the end of the participation at about 16 weeks
Sheard Criterion
Sheard criterion calculated from measurements of phoria and fusional vergence reserves. Values obtained after participants wore the reference lens and the test lens will be compared.
Time frame: From enrollement to the end of the participation at about 16 weeks
Vergence Capacity
Vergence capacity assessed using fusional vergence measurements (in prismatic diopter) obtained under standard clinical conditions. Results after participants wore the reference lens and the test lens will be compared.
Time frame: From enrollement to the end of the participation at about 16 weeks
Maximum Comfortable Convex And Concave Lens Power
Maximum convex or concave lens power (in diopter) that can be comfortably accepted while maintaining clear binocular vision. Values obtained after participants wore the reference lens and the small-power lens will be compared.
Time frame: From enrollement to the end of the participation at about 16 weeks
Accommodative Lag
Accommodative lag measured in diopters during a near-vision task using an objective method of accommodation assessment. Values obtained after participants wore the reference lens and the test lens will be compared.
Time frame: From enrollement to the end of the participation at about 16 weeks
Day effect on Accommodative Lag
Difference in diopter between morning and evening accommodative lag measurements.
Time frame: From enrollement to the end of the participation at about 16 weeks
Diurnal change in refraction
Difference between morning and evening refraction measurements. Diurnal changes will be compared between the reference lens and the small-power lens conditions.
Time frame: From enrollement to the end of the participation at about 16 weeks
Day effect on near phoria
Difference between morning and evening measurements of near phoria (in prismatic diopter). Diurnal changes will be compared between the reference lens and the small-power lens conditions.
Time frame: From enrollement to the end of the participation at about 16 weeks
Day effect on Sheard Criterion
Difference between morning and evening Sheard criterion values. Diurnal changes will be compared between the reference lens and the small-power lens conditions.
Time frame: From enrollement to the end of the participation at about 16 weeks
Day effect on AC/A ratio
Difference between morning and evening accommodative convergence to accommodation (AC/A) ratio measurements. Diurnal changes will be compared between the reference lens and the small-power lens conditions.
Time frame: From enrollement to the end of the participation at about 16 weeks
Diurnal change in Fusional Vergence Reserves
Difference in prismatic diopter between morning and evening fusional vergence reserve measurements. Diurnal changes will be compared between the reference lens and the small-power lens conditions.
Time frame: From enrollement to the end of the participation at about 16 weeks
Diurnal Change in Binocular Accommodative Facility
Difference between morning and evening binocular accommodative facility measurements expressed in cycles per minute. Diurnal changes will be compared between the reference lens and the small-power lens conditions.
Time frame: From enrollement to the end of the participation at about 16 weeks
Diurnal Change in Monocular Accommodative Facility
Difference between morning and evening monocular accommodative facility measurements expressed in cycles per minute. Diurnal changes will be compared between the reference lens and the small-power lens conditions.
Time frame: From enrollement to the end of the participation at about 16 weeks
Association Between Lens Satisfaction and Refractive Measures
Association between participant satisfaction scores, cycloplegic refraction measurements, and subjective refraction measurements evaluated at the end of the study.
Time frame: From enrollment to the end of the participation at about 16 weeks
Plan to share: No
No publications or documents are linked to this record.
Start is estimated for Sep 2026; primary completion for Aug 2027, 11 months later.
How these figures are worked out, and which studies are left out of them.
From the registry record's own update history. This site started tracking changes on Sep 25, 2026; for anything earlier, see the record history on ClinicalTrials.gov ↗
This study is not yet recruiting, as verified in Jun 2026. You cannot join it, but the record below documents what was studied.
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