---
title: How is keratoconus diagnosed?
description: "Keratoconus is diagnosed using a combination of clinical examination and advanced corneal imaging. Early detection is important because treatment is most effective before the condition becomes advanced. ## Clinical Assessment An eye specialist will check visual acuity, refraction, and examine…"
url: "https://bluefinvision.com/knowledge-base/topics/conditions-diseases/how-is-keratoconus-diagnosed/"
updated: "2025-12-11"
category: "Conditions & Diseases"
---

# How is keratoconus diagnosed?

Keratoconus is diagnosed using a combination of clinical examination and advanced corneal imaging. Early detection is important because treatment is most effective before the condition becomes advanced.

## Clinical Assessment

An eye specialist will check visual acuity, refraction, and examine the cornea at the slit lamp for signs such as thinning or irregular reflection. A history of frequent prescription changes or significant astigmatism raises suspicion.

- Visual acuity and refraction testing
- Slit-lamp assessment of corneal clarity and shape
- Review of family history and eye rubbing habits

## Specialist Imaging

Corneal topography and tomography create detailed maps of the corneal shape and elevation, revealing subtle cone formation. Pachymetry measures corneal thickness and helps grade severity.

## Screening

For patients at higher risk, the Keratoconus Screening Score and epithelial mapping provide sensitive early detection; these are described in the article [keratoconus screening score](https://bluefinvision.com/blog/keratoconus-screening-score-kcs-accurate-assessment-for-early-detection/).