Assessment of Progressive Lens Designs

Assessment of Progressive Lens Designs


Lead Sponsor: University of Milano Bicocca

Collaborator: HOYA Corporation Vision Care

Source University of Milano Bicocca
Brief Summary

Non-invasive double-blind randomised comparative study on presbyopic subjects wearing progressive lenses.

Detailed Description

Background and rationale: Nowadays many different types of progressive addition lenses are available for the correction of presbyopia. Progressive addition lenses provide a more natural correction for presbyopic people due to a gradual and progressive increase of lens power from far area through the intermediate portion to the near area. However, some patients still experience adaptation problems. The primary purpose of the study is to evaluate the preference, adaptability and visual performance of progressive lens designs (up to three designs). Study procedures: Each participant is required to wear all pairs of spectacles one after another, each pair for one week. Each participant will be required to visit the optometry clinic (at University of Milano Bicocca) three times: Visit #1: Screening based on inclusion criteria, Informed Consent Form (ICF) form signing, Optometric exam and choice of the frame. Subjects who will pass the inclusion/exclusion screening will be asked to sign the ICF and enrolled for the optometric exam. Subjects will choose the spectacle frame and all individual fitting parameters will be measured for lens' manufacturing. Visit #2: Subjects will receive three marked pairs of progressive lenses. The three spectacle frames will be adjusted to fit properly on the subject' face. After 10-15 min of wearing of the first pair of lenses, each subject will be asked to answer to a questionnaire. Visit #3 (last visit): questionnaires should be returned; the last comparison question will be answered during this visit, and subject will choose the best pair. At the end of the study each participant will be entitled to get one pair of progressive lenses available in the market. Subject population: Presbyopic subjects have been already wearing any progressive additional lens (PAL) designs. Number of Subjects: 40 +/- 2 subjects, the specified PAL design wearers and 40 +/- 2 the other PAL design wearers to be enrolled and signed the informed consent form. Each subject will be wearing three different PAL designs. Subjects will be asked to choose one pair of spectacles (design) which they like the most. Randomisation: This study adopts a stratified permuted block randomisation to reduce an evaluation bias by the wearing sequence and prescriptions. The mean of both eyes' prescriptions is set as a single stratification factor. Frames: Each subject will choose a model of spectacle frame. Three identical frames will be taken for each subject. Lenses: 1. Lenses will be produced in EU 2. Three different lens designs will be tested in the study.

Overall Status Recruiting
Start Date 2020-10-19
Completion Date 2021-04-01
Primary Completion Date 2021-04-01
Phase N/A
Study Type Interventional
Primary Outcome
Measure Time Frame
Evaluate the preference among progressive lens designs Entire study duration (approx. 4 weeks)
Secondary Outcome
Measure Time Frame
Evaluate the adaptability of progressive lens designs. Entire study duration (approx. 4 weeks)
Evaluate visual performance of progressive lens designs. Entire study duration (approx. 4 weeks)
Enrollment 80

Intervention Type: Device

Intervention Name: Progressive Additional Lenses (PAL), pre calibrated and made of polymeric material with anti-reflection coating

Description: Subjects will be wearing three different PAL designs with different geometries of the optical progression.



Inclusion Criteria: 1. Subjects should be experienced progressive lens designs wearers who have worn their current prescription for at least the last one month. 2. PAL wearers with 14 mm corridor 3. Age: 45 to 70 years old 4. Best Corrected Monocular visual Acuity (decimal) both at distance and near ≥ 1.0; 5. Normal binocular vision at distance & near: - no strabismus on cover test, - no fixation disparity (Mallett aligning prism of less than 2Δ horizontally or vertically) at near - stereoacuity of 60" or better at near; 6. New prescription (found at visit #1) is in the range: - Spherical power: up to +/-6.00; - Cylindrical power: minus cylinder ≤ 2.5D; - Addition: 1.50-2.50D; - Difference in the power (spherical equivalent) between eyes: up to 2.0D 7. Understanding and speaking Italian or English to be able to answer questionnaires 8. Giving a written consent to participate in the study Exclusion Criteria: 1. First prescription for progressive lenses. 2. Prescription found during visit#1 varies from current prescription more than 0.50D in any meridian 3. Wearing Single Vision lenses with accommodative support 4. Double vision or prismatic prescription in current glasses; 5. Known ocular disease including strabismus, any pathology, any eye surgeries that may affect visual acuity 6. Use of systemic or ocular medications that are likely to affect vision 7. Balance problem/vertigo problem 8. Concurrent participation in other vision-related research



Minimum Age:

45 Years

Maximum Age:

70 Years

Healthy Volunteers:


Overall Contact

Last Name: Silvia Tavazzi

Phone: +39 0264485035

Email: [email protected]

Facility: Status: Contact: Investigator: Optics and Optometry of Milano-Bicocca (COMiB), Department of Materials Science - University of Milano-Bicocca Silvia Tavazzi +39 0264485035 [email protected] Silvia Tavazzi Principal Investigator Fabrizio Zeri Sub-Investigator
Location Countries


Verification Date


Responsible Party

Type: Principal Investigator

Investigator Affiliation: University of Milano Bicocca

Investigator Full Name: Silvia Tavazzi

Investigator Title: Professor

Has Expanded Access No
Condition Browse
Number Of Arms 2
Arm Group

Label: The specified PAL design wearers

Type: Experimental

Description: Subjects who have been already wearing any from specified design type of PAL

Label: The other PAL design wearers

Type: Active Comparator

Description: Subjects who have been already wearing any from the other design type of PAL

Acronym TBPD
Study Design Info

Allocation: Randomized

Intervention Model: Parallel Assignment

Primary Purpose: Other

Masking: Triple (Participant, Care Provider, Investigator)

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