Standardized Ishihara

Carrot delivers the same standard Ishihara plate sequence clinicians have used for over a century—but through calibrated VR optics that eliminate the three biggest sources of variability in paper-plate testing: plate fading (Ishihara himself recommended replacing plates every ten years as the inks shift), exam-room lighting differences (fluorescent vs daylight vs incandescent changes the scoring), and examiner-to-examiner subjectivity in marking responses. Carrot also scores plate-by-plate automatically and tests each eye independently, surfacing acquired asymmetric defects that binocular paper testing tends to miss.

Ishihara is fundamentally a screening test—it reliably flags the presence of red-green color deficiency and can suggest the depth of the deficit through the response pattern, but it doesn’t quantitatively classify protan vs deutan defects the way arrangement tests like Farnsworth D-15 do. For patients who screen positive on Ishihara and need formal classification—whether for occupational certification, neuro-ophthalmic workup, or hereditary disease evaluation—the Farnsworth D-15 protocol is on Carrot’s near-term roadmap and will deliver that classification through the same headset.

A complete Ishihara screening on Carrot typically takes approximately 1 minute per eye. Each plate is presented for a standardized exposure with the patient’s response captured before advancing.

Carrot’s color vision exam supports CPT 92283 (color vision examination, extended)—the standard reimbursable code for clinical color vision testing. The exam produces the documentation required to support the code: standardized presentation, plate-by-plate response capture, per-eye scoring, and timestamped exam metadata. Specific reimbursement rates and code applicability vary by payer and clinical scenario—consult your billing team or the most recent Medicare Physician Fee Schedule for current figures.

Yes. Color vision testing runs on the same wireless Carrot headset as visual field testing, contrast sensitivity, pupillometry, and ocular motility. Technicians can queue multiple exams in a single patient session through the Carrot portal—one device, one setup, one consolidated report set—without moving the patient between rooms or relaunching the headset between tests. This is particularly useful for neuro-ophthalmic workups where color vision pairs naturally with visual field and pupillometry testing.

Yes, it is included in all subscription tiers.