ClinicalTrials.gg
Not yet recruitingNCT04875234Updated Mar 22, 2023

Vision Improvement for Legally Blind Dry AMD Patients

An observational study in Dry Age-related Macular Degeneration and Vision Impairment and Blindness, sponsored by Optimal Acuity Corporation. Not yet recruiting. Open to participants aged 50 Years to 100 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2023-03-22.

Primary conditionBlindnessRegistry: Vision DisordersReclassifiedWhy we changed it
Registry
Vision Disorders — the first condition term the registry derived for this study.
ClinicalTrials.gg
Blindness
Why
  1. The study's listed conditions name Blindness, a narrower term within Vision Disorders.
Confidence
High: the new condition is named in the study's own listed conditions. Of 351 hand-checked studies reclassified this way, 68% were exactly right and 84% in the right disease family; the registry's first term was right for 5% (measured 2026-10-21). How we classify →
Wrong?
Tell us the study's main condition →

Sponsored by Optimal Acuity Corporation · Observational

From the registry’s dates

  • Primary completion was expected by Jul 2025, 1 year 4 months ago, but the record still lists the study as not yet recruiting.
Study type
Observational
Model
Cohort
Time perspective
Retrospective
Enrollment
40
Ages
50 Years to 100 Years
Sex
All
01

Study summary

This retrospective observational study is intended to assess the feasibility of using a nonsignificant risk device for vision improvement for legally blind dry AMD patients.

Read the detailed description

This retrospective observational study is intended to assess the feasibility of using a nonsignificant risk device for vision improvement for legally blind dry Age-Related Macular Degneration patients. 12-month follow-up examinations will be used to assess the amount of vision improvement and its dependence on device parameters.

02

Conditions studied

  • Dry Age-related Macular Degeneration
  • Vision Impairment and Blindness

Browse trials for

Keywords

  • AMD, vision impairment, blindness
03

In context

Blindness Reclassified

144 studies on the registry are indexed under Blindness; 33 are open to participants now.

This study's planned enrollment of 40 is below the median of 76 across 35 observational studies indexed under Blindness.

Browse Blindness studies →

Lead sponsor

Optimal Acuity Corporation is the lead sponsor of 4 studies on the registry; 2 are open to participants now.

Compared within Blindness, this study's primary condition as ClinicalTrials.gg classifies it; the registry's first condition term is Vision Disorders. The counts are of registry records indexed under each term, refreshed daily. How we classify →

04

Who can participate

Ages eligible
50 Years to 100 Years
Sexes eligible
All
Accepts healthy volunteers
Yes
Sampling method
Non-probability sample

Study population

Patients with dry age-related macular degeneration an legal blindness in one or both eyes

Eligibility criteria

IInclusion Criteria:

  • Male or Female
  • Any race
  • Patient is at least 50 years old.
  • Patient must have dry AMD in the study eye.
  • Patient is legally blind due to AMD - i.e., has corrected distance visual acuity (CDVA) of 20/125 or worse (45 letters; logMAR ≥ 0.80) in the study eye.
  • Patient has normal corneal surface topography on videokeratography (i.e., without distorted or unclear corneal mires).
  • Patient is not a contact lens wearer.
  • Patient is willing and able to comply with all examinations.
  • Patient must be competent to sign an form before study entry.

Exclusion Criteria:

  • Visually significant cataract in the study eye
  • Presence of a visually significant posterior capsule opacity if prior cataract surgery has been performed in the study eye
  • Any visually significant disease process in any ocular structure other than AMD that would affect vision in the study eye
  • Previous corneal surgery in the study eye
  • Presence or history of any other condition or finding that, in the opinion of the investigator, makes the patient unsuitable as a candidate for study participation or may confound the outcome of the study
Terms in these criteria, in plain language(1)

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.

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.

05

Study design

Observational model
Cohort
Time perspective
Retrospective
Enrollment
40 participants (estimated)
Patient registry
No

Groups and cohorts

  • Legally Blind Dry AMD Patients

    Legally Blind Dry AMD Patients with either unilateral or bilateral blindness

    Device: Clear-K Low Vision Aid Treatment

Interventions

  • DeviceClear-K Low Vision Aid Treatment

    A Clear-K Low Vision Aid Device is used to produce small corneal shape and refraction changes in order to redirect light onto functional areas of the retina.

06

What researchers measure

Primary outcomes

  1. Best spectacle-corrected distance visual acuity (BCDVA)

    BCDVA measured using ETDRS eye charts

    Time frame: 12 months post-treatment

07

Study locations

No study locations are listed for this record.

08

References and documents

Individual participant data

Plan to share: Undecided — Undecided

No publications or documents are linked to this record.

09

Updates

Tracking since Sep 25, 2026
No changes since tracking began. The registry record was last updated on Mar 22, 2023, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
10

Registry details

Key details

Study ID
NCT04875234
Lead sponsor
Optimal Acuity Corporation
Responsible party
Sponsor
First posted
May 6, 2021
Start date
Jan 2024 (estimated)
Primary completion
Jul 2025 (estimated)
Completion
Dec 2026 (estimated)
Last update
Mar 22, 2023

Study contacts

Michael Berry, PhD
Contact
mberry177@gmail.com
831-869-1384
Michael Berry, PhD
principal investigator · Optimal Acuity Corporation

Oversight

Data monitoring committee
No
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is not yet recruiting, as verified in Apr 2022. You cannot join it, but the record below documents what was studied.

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Discussion

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