Ocular endpoint data is most reliable when every visit happens under consistent, controlled conditions: the right ETDRS chart distance, controllable lighting, calibrated ophthalmic equipment, and certified staff. Some sites have all four in place. Others are missing equipment, staff, or space, and many participants live far from a site that has them. So the real question for sponsors is not mobile versus clinic. It is which delivery model fits each site's capabilities and each participant population, whether that is a Mobile Vision Clinic, a Mobile Vision Pod, a Mobile Clinic Suite, or the site's existing ophthalmic capacity.
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Traditional trials route ophthalmic assessments through site-based ophthalmology clinics or outsourced optometrists. Endpoint quality then depends partly on factors outside the sponsor's direct control, such as whether patients make each visit and how consistently each location's equipment and staff perform the test.
Both are getting harder to count on. A 2024 workforce study in Ophthalmology projects that U.S. ophthalmologist supply will fall 12% between 2020 and 2035 while demand rises 24%, leaving a 30% workforce shortfall. The same study projects 29% workforce adequacy in nonmetro areas by 2035, compared with 77% in metro areas. For a sponsor, that means fewer qualified eye care providers near the participants who most need access.
Travel is the other pressure point. Long drives to a site raise the risk of missed visits, and missed visits leave gaps in longitudinal endpoint data. 20/20 Onsite's point-of-need model has reduced participant travel distance by 80.6%.
Yes. A mobile clinic can collect ocular endpoint data when its exam space meets the same standards a site would: correct test distance, controlled lighting, calibrated equipment, and certified staff following the protocol. What matters is not whether the exam happens in a Mobile Vision Clinic or at a fixed site, but whether the conditions and procedures are the same.
Visual acuity testing shows why. An NEI/FDA endpoints workshop report notes that visual acuity measured with the ETDRS chart has high test-retest reliability. That reliability depends on a fixed chart distance and consistent lighting, which is why trials use ETDRS charts rather than a standard Snellen chart.
20/20 Onsite's Mobile Vision Clinic (MVC) exam lane was the first mobile clinic to earn Site Readiness Certification from Precision Vision for best corrected visual acuity (BCVA) testing, covering ETDRS distance and fully controllable lighting. Clinical teams also review retinal imaging before patients leave the MVC, so a poor OCT scan or fundus photo gets retaken on the spot rather than flagged later by the reading center.
See the exam lane for yourself. Tour the Mobile Vision Clinic.
Each model trades off reach, control, and setup effort differently. In-clinic assessments are often the right choice when a site already has certified ophthalmic capacity. Where a site or region has gaps, 20/20 Onsite can add a Mobile Vision Clinic, Pod, or Suite, or combine them with the site's existing capacity.
Mobile vs. In-Clinic Ocular Assessment Models
| Factor | Site-Based In-Clinic | Mobile Vision Clinic (MVC) | Mobile Vision Pod (MVP) | Mobile Clinic Suite (MCS) |
|---|---|---|---|---|
| What It Is | Assessments at an existing ophthalmology clinic or research site | Specially equipped, fully staffed vehicle | Semi-permanent, modular exam space placed at a site | Ophthalmic equipment and certified staff brought into existing exam rooms |
| Participant Travel | Participant travels to the site | Clinic travels to where patients live, work, or gather | Participant travels to the host site | Participant travels to the host site |
| Best Fit | Sites with certified ophthalmic staff and equipment already in place | Dispersed, rural, or rare disease populations | Long-running studies at one site | Sites with space but no ophthalmic equipment or staff |
| Main Consideration | Consistency across sites depends on each site's setup | Scheduling routes around participant locations | Needs dedicated space at or beside the site | Depends on available exam room time at the site |
Start with where your participants are and what your sites already have. Those two answers usually point to the right model, or the right mix across sites.
"Sponsors often ask whether a Mobile Vision Clinic can match a site. The better question is which model gives each site and its participants the same controlled conditions at every visit, and sometimes that is the site itself." Dr. David Gibson, OD, Chief Clinical Officer, 20/20 Onsite.
Teleophthalmology and home monitoring can support screening and between-visit checks, but for most primary ocular endpoints today, calibrated in-person assessments remain the standard. BCVA on an ETDRS chart, OCT, tonometer readings for intraocular pressure (IOP), and visual field testing generally depend on controlled equipment and trained operators.
Our breakdown of what objective ocular endpoints can move off-site explains where the line falls in decentralized and hybrid trials.
Use these questions with any vendor or site before committing to a delivery model.
Ocular endpoint data holds up best in the setting that keeps conditions consistent and patients engaged. For some trials, that is an existing clinic, for others, a Mobile Vision Clinic, Pod, or Suite, and often a mix across sites. 20/20 Onsite runs Mobile Vision Clinics, Mobile Vision Pods, and Mobile Clinic Suites, so sponsors can match the model to each site and region rather than forcing one approach on every study.
Talk to an Ophthalmic Trial Specialist to find the right mix for your trial.
Find the Right Assessment Model for Your Trial
Talk with 20/20 Onsite about matching Mobile Vision Clinics, Mobile Vision Pods, and Mobile Clinic Suites to your sites and participants.
Talk to an Ophthalmic Trial SpecialistYes, as long as the mobile exam space meets the same standards as a research site: correct ETDRS chart distance, controllable lighting, calibrated equipment, and certified staff. 20/20 Onsite's Mobile Vision Clinics are built to that standard and perform BCVA, OCT, IOP, visual field testing, and fundus photography at the point of need. Images are reviewed before the patient leaves, which reduces rescans.
How Do Mobile Vision Clinics (Vision Vans) Compare to In-Clinic Assessments for Accuracy?Accuracy depends on test conditions and technique, not on whether the exam room has wheels. A certified mobile lane with fixed ETDRS distance, controlled lighting, and calibrated equipment can deliver results comparable to a well-equipped site exam. The key is using the same procedures, equipment standards, and training at every location, whether assessments happen at a site, in a Mobile Vision Clinic, or both.
What Point-of-Need Delivery Models Are Available for Ocular Endpoints?20/20 Onsite offers three: Mobile Vision Clinics (MVCs), which travel to participants; Mobile Vision Pods (MVPs), semi-permanent exam spaces placed at a research site; and Mobile Clinic Suites (MCSs), which bring equipment and certified staff into existing exam rooms. Many trials combine models across sites and regions.
What Is a Mobile Vision Clinic?A Mobile Vision Clinic is a specially equipped, fully staffed vehicle that performs certified ophthalmic assessments almost anywhere, including at patients' homes, workplaces, or research sites. Each MVC carries calibrated ophthalmic equipment and trained ophthalmic clinicians. It reduces geographic barriers to participation while keeping assessments consistent with the protocol.
Can Someone Bring Ophthalmic Equipment and Certified Staff Into Our Existing Clinic Exam Rooms?Yes. A Mobile Clinic Suite brings portable ophthalmic equipment and certified personnel into your existing exam rooms and works within current clinic operations. It suits sites that have space but lack ophthalmic equipment or staff. Talk to an Ophthalmic Trial Specialist to check fit for your sites.
Is It Possible to Set Up a Semi-Permanent Eye Exam Space at a Research Site?Yes. A Mobile Vision Pod is a customizable, self-contained exam space that stays at a research site for the full study. It gives long-running trials a stable, calibrated testing room without building permanent infrastructure. Timelines depend on site readiness, equipment lead time, and study complexity.
Can Teleophthalmology or Home Monitoring Replace In-Person Ocular Endpoint Assessments?Not for most primary ocular endpoints. Remote tools can support screening and between-visit monitoring, but BCVA, OCT, IOP, and visual field endpoints generally depend on calibrated equipment and trained operators. Point-of-need delivery brings those in-person assessments closer to participants instead.
How Does 20/20 Onsite Speed Up Data Review and Turnaround?Clinical teams review images before patients leave the Mobile Vision Clinic, so quality issues get fixed during the visit rather than after a reading center query. When dosing schedules require it, 20/20 Onsite has delivered same-day results, as it did in a Phase 1 study for Syneos Health.