---
title: "What is polarization-sensitive OCT?"
description: "Polarization-sensitive OCT is a specialised form of optical coherence tomography that records changes in light polarisation as it passes through ocular tissues. It provides additional contrast related to tissue birefringence and composition. ## Principles Certain structures, such as nerve fibre…"
url: "https://bluefinvision.com/knowledge-base/topics/diagnostics-testing/what-is-polarization-sensitive-oct/"
updated: "2025-12-11"
category: "Diagnostics & Testing"
---

# What is polarization-sensitive OCT?

Polarization-sensitive OCT is a specialised form of optical coherence tomography that records changes in light polarisation as it passes through ocular tissues. It provides additional contrast related to tissue birefringence and composition.

## Principles

Certain structures, such as nerve fibre layers and collagen-rich tissues, alter the polarisation state of light. By analysing these changes, polarization-sensitive OCT can map features like fibre orientation, depolarising lesions, or melanin-containing layers.

- Extends standard structural OCT with polarisation contrast information
- Produces images of phase retardation, degree of polarisation, and related metrics
- Particularly sensitive to retinal nerve fibre layer and retinal pigment epithelium
- Data acquisition and processing are more complex than conventional OCT

## Potential Uses

This technology is being investigated for enhanced assessment of glaucoma, age-related macular degeneration, and other conditions where tissue organisation is important. It may help differentiate lesion types or detect early structural changes.

- Could offer more specific markers of nerve damage than thickness alone
- May improve visualisation of fibrous or scarred tissues
- Currently mainly used in research rather than routine practice
- Further validation is needed before widespread clinical adoption