The Gold Standard in Vision Measurement.
Validated instruments, certified investigators, and standardized protocols across every site, every region, every phase. Manufactured in Woodstock, Illinois since 1965. Trusted by sponsors and CROs running ETDRS, AREDS, DRCR.net, and most major retinal and vision trials of the last thirty years.
Why Precision Vision
The Precision Vision Approach
Precision Vision standardizes visual endpoint measurement across sites, examiners, geographies, and timepoints through clinically grounded methodologies designed to support reproducibility and endpoint integrity. Measurement systems aligned to protocol-defined BCVA, contrast sensitivity, and functional vision endpoints. Uniform testing procedures implemented across sites to support consistency and reproducibility. Deploy Global deployment of standardized equipment, controlled testing environments, and clinical-grade visual assessment systems. Ongoing quality oversight designed to help maintain protocol compliance, examiner consistency, and endpoint integrity. The quality of a clinical trial is only as strong as the precision of its measurements.
PRODUCT CATEGORIES
Vision testing instruments engineered for measurement integrity.
Six instrument families covering visual acuity, contrast sensitivity, color vision, low vision, reading speed, and pediatric testing. Every product validated and peer-reviewed.
Visual Acuity Charts
ETDRS Revised 2000, Sloan Letters, HOTV, Lea Symbols, and pediatric optotypes. The standard for retinal trials, ophthalmology research, and clinical practice for over 50 years.
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Contrast Sensitivity
Pelli-Robson, Mars, and validated contrast sensitivity panels. Sensitive to early visual function changes that standard acuity testing misses.
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Reading Speed (iReST)
International Reading Speed Texts validated for low vision research and clinical assessment in seventeen languages. Tablet and print formats.
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Low Vision Testing
Specialized instruments for severely impaired vision: enhanced contrast, simplified optotypes, validated low-vision protocols.
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Pediatric Vision Testing
LEA Symbols, Teller Acuity Cards, HOTV, and shape-based optotypes for pre-literate and developmentally diverse populations.
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Clinical Trial Solutions
End-to-end ophthalmic trial infrastructure: certified equipment, investigator certification, training, and centralized quality monitoring.
Explore CTS →Protocol-Aligned Measurement Systems
Precision Vision provides protocol-aligned visual assessment systems designed to support reliable endpoint measurement across ophthalmic clinical research environments.
Our solutions support:
- Best Corrected Visual Acuity (BCVA)
- ETDRS visual acuity assessment
- Contrast sensitivity endpoints
- Functional vision evaluation
- Reading acuity assessment
- Low vision analysis
Solutions include:
- ETDRS charts
- ETDRS illuminator cabinets
- High-contrast testing systems
- Low-contrast testing systems
- Functional vision assessment tools
These systems are designed to support consistent endpoint measurement across longitudinal and multi-site studies.
Training & Certification
Site Certification & Examiner Training
Reliable endpoint assessment depends on standardized procedures and examiner alignment.
Precision Vision supports site certification and examiner training programs designed to help ensure:
- Consistent testing methodologies
- Standardized patient positioning
- Controlled luminance conditions
- Reliable BCVA assessment
- Protocol-compliant workflows
- Reproducible endpoint collection
Our certification methodologies help support consistency across sites, examiners, and patient populations while reducing procedural variability.
The instruments behind the science.
Bestsellers across clinical practice and clinical research. Every product manufactured in Woodstock, Illinois under ISO 13485:2016 quality management.
Support
Global Deployment & Support
Precision Vision supports global clinical trial deployment through standardized testing systems and ongoing implementation support.
Our deployment services help support:
- Global site readiness
- Standardized lane environments
- Equipment deployment consistency
- Protocol-aligned implementation
- Ongoing support and oversight
- Reliable visual assessment environments
Our systems are utilized internationally across ophthalmology clinical trials, academic research environments, and global study programs.
Gold Standard
Sponsors and CROs running ophthalmic, retinal, and neurology trials need measurement consistency that survives review by FDA, EMA, PMDA, and academic peer reviewers. PV has been the measurement layer behind ETDRS, AREDS, AREDS2, DRCR.net, and most major retinal trials of the last thirty years. Our role is to make endpoint variance the variable you can ignore — so your team can focus on protocol, recruitment, and analysis.
Quality & Data Oversight
Maintaining endpoint integrity requires ongoing oversight and standardized quality control.
Precision Vision supports measurement quality through:
- Standardized testing procedures
- Examiner performance alignment
- Protocol compliance support
- Controlled testing environments
- Endpoint consistency monitoring
- Reproducible assessment methodologies
These processes are designed to help support reliable data collection and scientific defensibility across clinical trial environments.
Standardized measurement, 47 sites, three regions.
A Phase III geographic atrophy program required identical visual acuity measurement across fourteen countries. PV deployed certified equipment, trained 189 investigators, and provided centralized quality oversight from protocol design through database lock.
"Across 47 sites in three regions, our visual acuity endpoint coefficient of variation was the lowest we've measured in any retinal trial."
Who We Partner With
Clinical Trial Sponsors Support endpoint integrity and regulatory defensibility from study design through final data submission. Enable scalable, standardized execution across global ophthalmic clinical trials with seamless integration across study environments. Deliver protocol-compliant testing through certified equipment, standardized procedures, and controlled visual assessment environments.
The Validation Evidence Binder
Built for your evidence file.
Used by sponsor regulatory teams as the credibility appendix in clinical trial submissions. Cite-ready references, peer-reviewed publication index, and per-instrument validation studies.
Why Precision Vision
Why Precision Vision
Endpoint Integrity & Reproducibility Testing systems designed to support reliable and reproducible visual endpoint measurement. Standardized Clinical Trial Methodologies Solutions engineered to help reduce variability across sites, examiners, and testing environments. Methodologies designed to support scientific defensibility, protocol compliance, and standardized assessment practices. Supporting ophthalmic research, visual assessment, and clinical endpoint measurement worldwide.
Research & Academic
Advancing Reliable Ophthalmic Research Through Standardization
Precision Vision has supported generations of sponsors, CROs, researchers, clinicians, and academic institutions through clinically trusted visual assessment methodologies designed for reproducibility, standardization, and endpoint integrity. Our commitment to scientific rigor and precision-engineered testing systems continues to support evolving ophthalmic clinical trial and vision science needs worldwide.
ETDRS & Visual Acuity Testing
ETDRS & Visual Acuity Testing
What is ETDRS testing?
ETDRS testing is a standardized logMAR visual acuity methodology widely utilized because of its reproducibility and consistency in visual assessment.
What is BCVA testing?
Best Corrected Visual Acuity (BCVA) testing measures a patient’s optimal visual acuity using standardized correction and testing methodologies.
Why are ETDRS charts considered the gold standard?
ETDRS charts use standardized logarithmic progression, equal spacing, and reproducible scoring designed to support reliable visual acuity assessment.
What is the difference between ETDRS and Snellen charts?
ETDRS charts use standardized logMAR methodology for greater consistency and reproducibility, while Snellen charts use variable spacing and progression.
What is an ETDRS Illuminator Cabinet?
An ETDRS Illuminator Cabinet is a standardized illuminated testing system designed to provide controlled luminance for visual acuity assessment.
Why is luminance important in visual assessment?
Inconsistent luminance can impact visual acuity outcomes and introduce variability across testing environments.