News and Publications Hub

AllNewsPress ReleaseProductsThought PiecesVision InfoState GuidelinesCase Studies
Why HOTV May Be a Better Fit for Preschool Vision Screening

Why HOTV May Be a Better Fit for Preschool Vision Screening

New research comparing HOTV and tumbling E visual acuity testing found the largest differences in children younger than 8. For preschool children, HOTV produced better...
An assortment of clinical prism bars and loose prism lenses arranged on a clean white surface, with light refracting through the glass to create soft spectral color bands.

Prism in Clinical Practice: A Guide to Bars, Loose Prisms & Fresnel Selection

A clinical decision guide comparing prism bars, loose prisms, Fresnel press-on prisms, and Risley prisms, covering material-specific holding techniques, measurement accuracy, and evidence-based applications across...
Neutral density filter bars arranged on a clean clinical surface with soft ophthalmic examination equipment visible in the background.

Neutral Density Bars: When and How to Use Them in Clinical Practice

A clinical guide to neutral density bars covering RAPD quantification, amblyopia differentiation, suppression measurement, and emerging applications in binocular vision therapy, with practical tips for...
A professional ophthalmic exam room with an illuminated ETDRS visual acuity chart cabinet mounted on the wall under precise clinical lighting.

ETDRS Chart Setup for Multi-Site Clinical Trials: A Compliance Guide

A practical compliance guide for sponsors, CROs, and site coordinators setting up ETDRS visual acuity testing across multi-site clinical trials, covering illumination standards, cabinet selection,...
Vectograms vs. Aperture Rule vs. Brock String: A Vision Therapist's Clinical Selection Guide

Vectograms vs. Aperture Rule vs. Brock String: A Vision Therapist's Clinical Selection Guide

A clinical decision framework comparing vectograms, the aperture rule, and the Brock string across suppression depth, vergence type, and therapy phase, grounded in the CITT...
An organized flat-lay arrangement of various trial frame sizes and occluder accessories on a clean clinical surface, representing optometric refraction tools for diverse patient populations.

Trial Frame & Occluder Combos: A Clinical Guide by Patient Type

A clinical reference guide matching trial frame sizes and occluder types to specific patient populations, including pediatric, nystagmus, low vision, and outreach settings, with evidence-based...
Stereoacuity Testing 101: How to Screen Depth Perception in Pediatric Eye Exams

Stereoacuity Testing 101: How to Screen Depth Perception in Pediatric Eye Exams

A child can pass 20/20 acuity testing and still have deficient depth perception. This clinical guide explains why stereoacuity testing is essential in pediatric eye...
Contrast Sensitivity Testing: When 20/20 Isn't Enough

Contrast Sensitivity Testing: When 20/20 Isn't Enough

A patient can read the 20/20 line perfectly and still struggle with night driving, face recognition, and stair navigation. This article provides a practical clinical...
HRR, Ishihara & Farnsworth D-15: An Optometrist's Comparison Guide

HRR, Ishihara & Farnsworth D-15: An Optometrist's Comparison Guide

This clinical comparison guide breaks down the Ishihara, HRR 4th Edition, and Farnsworth D-15 color vision tests, helping optometrists choose the right tool for screening,...
LEA SYMBOLS vs. HOTV vs. Tumbling E: Pediatric Eye Chart Comparison for 2026 Clinical Practice

LEA SYMBOLS vs. HOTV vs. Tumbling E: Pediatric Eye Chart Comparison for 2026 Clinical Practice

The 2025 NCCVEH guidelines recommend only LEA SYMBOLS and HOTV with crowding bars for preschool vision screening. This clinical guide compares LEA SYMBOLS, HOTV, and...
ETDRS

LED ETDRS System Clinical Evaluation Results

Independent evaluation shows Good-Lite LED ETDRS system delivers repeatable, clinically equivalent visual acuity results with improved consistency. ...
HRR

HRR: The Only Color Vision Test Worth Using

HRR sets the standard in modern color vision testing by detecting both congenital and acquired deficiencies with graded clinical accuracy. When precision matters, HRR delivers...
ESC2000

ESC2000™ Illuminated ETDRS Clinical Trial Cabinet

Ensure precise and standardized contrast sensitivity and ETDRS acuity testing with the CSV-1000® Illuminated Viewer. Trusted by clinicians in over 60 countries, this device is...
CSV-1000

CSV-1000® Contrast Sensitivity and Acuity Testing System

Ensure precise and standardized contrast sensitivity and ETDRS acuity testing with the CSV-1000® Illuminated Viewer. Trusted by clinicians in over 60 countries, this device is...
HRR Tests

The HRR Color Testing System: The World's Most Advanced Color Vision Test

When it comes to color vision testing, the HRR (Hardy Rand and Rittler) 4th Edition sets the gold standard. Whether you're assessing for congenital or...
1 2