---
title: What is keratoconus?
description: "Keratoconus is a progressive thinning and cone-shaped bulging of the cornea that can cause irregular astigmatism and blurred vision. It often begins in adolescence or early adulthood and may progress at different rates in each eye. ## Typical features People…"
url: "https://bluefinvision.com/knowledge-base/topics/conditions-diseases/what-is-keratoconus/"
updated: "2025-12-11"
category: "Conditions & Diseases"
---

# What is keratoconus?

Keratoconus is a progressive thinning and cone-shaped bulging of the cornea that can cause irregular astigmatism and blurred vision. It often begins in adolescence or early adulthood and may progress at different rates in each eye.

## Typical features

People may notice increasing short-sightedness, ghosted images or frequent changes in spectacle prescription. Advanced cases can develop scarring or sudden swelling if the cornea cracks and fluid enters the tissue.

- Often affects both eyes but to different degrees
- Associated with eye rubbing and some atopic conditions
- Can run in families, so relatives may benefit from screening
- Early diagnosis allows consideration of corneal cross-linking to slow change

## Further information

Keratoconus management, including cross-linking and contact lens fitting, is provided within corneal and [laser eye surgery](https://bluefinvision.com/laser-eye-surgery/) services at Blue Fin Vision®. The blog [what is keratoconus?](https://bluefinvision.com/blog/what-is-keratoconus/) explains symptoms, diagnosis and treatment options in more detail.