---
title: Cross Linking Corneal Biomechanical Evaluation of CATS Tonometer Prism
nct_id: NCT04180111
overall_status: UNKNOWN
sponsor: Intuor Technologies, Inc.
study_type: OBSERVATIONAL
primary_condition: Keratoconus
countries: United States
canonical_url: "https://parkinsonspathways.com/agent/trials/NCT04180111.md"
clinicaltrials_gov: "https://clinicaltrials.gov/study/NCT04180111"
ct_last_update_post_date: 2019-11-27
last_seen_at: "2026-05-12T06:33:45.885Z"
source: ClinicalTrials.gov (mirrored, no enrichment)
---
# Cross Linking Corneal Biomechanical Evaluation of CATS Tonometer Prism

**NCT ID:** [NCT04180111](https://clinicaltrials.gov/study/NCT04180111)

## Key Facts

- **Status:** UNKNOWN
- **Study Type:** OBSERVATIONAL
- **Target Enrollment:** 18
- **Lead Sponsor:** Intuor Technologies, Inc.
- **Conditions:** Keratoconus
- **Start Date:** 2019-05-05
- **Completion Date:** 2019-12-30
- **CT.gov Last Update:** 2019-11-27

## Brief Summary

The purpose of this study is to determine if the device, CATS tonometer prism, measures intraocular pressure significantly differently than the current standard of care tonometer prism (Goldmann) before and after a corneal crosslinking procedure. This difference would be a measurement of the amount of corneal biomechanical changes made due to the cross-linking procedure.

## Detailed Description

This clinical trial is a prospective, controlled, study and will be performed at one clinical investigative sites in Tucson Arizona1. The purpose of this study is to determine if the device, CATS tonometer prism, measures intraocular pressure significantly differently than the current standard of care tonometer prism (Goldmann) before and after a corneal crosslinking procedure. This difference would be a measurement of the amount of corneal biomechanical changes made due to the cross-linking procedure.

## Eligibility

- **Minimum age:** 18 Years
- **Maximum age:** 101 Years
- **Sex:** ALL
- **Healthy Volunteers:** No

```
Inclusion Criteria:

* Male and female patients, at least 18 years of age
* Subject has a clear understanding and agrees to all the conditions of the informed consent form

Exclusion Criteria:

* • Subject has undergone ocular surgery within the last 3 months

  * Uncontrolled systemic disease that in the opinion of the Investigator would put the subject's heath at risk
  * Pregnant or nursing women
  * Those who have had corneal surgery including corneal laser surgery
  * Microphthalmos
  * Buphthalmos
  * Severe Dry eyes
  * Lid squeezers - blepharospasm
  * Nystagmus
  * corneal or conjunctival infection.
```

## Interventions

- **CATS Tonometer** (DEVICE) — CATS Tonometer Prism

## Primary Outcomes

- **IOP measurement** _(time frame: 6 months)_ — comparative IOP measurement between CATS and GAT tonometer prisms

## Locations (1)

- Arizona Eye Consultants, Tucson, Arizona, United States — _RECRUITING_

## Recent Field Changes (last 30 days)

- `status.overallStatus` — added _(2026-05-12)_
- `status.primaryCompletionDate` — added _(2026-05-12)_
- `status.completionDate` — added _(2026-05-12)_
- `status.lastUpdatePostDate` — added _(2026-05-12)_
- `design.enrollmentCount` — added _(2026-05-12)_
- `eligibility.criteria` — added _(2026-05-12)_
- `eligibility.minAge` — added _(2026-05-12)_
- `eligibility.maxAge` — added _(2026-05-12)_
- `eligibility.sex` — added _(2026-05-12)_
- `outcomes.primary` — added _(2026-05-12)_
- `armsInterventions.interventions` — added _(2026-05-12)_
- `sponsor.lead` — added _(2026-05-12)_
- `results.hasResults` — added _(2026-05-12)_
- `locations.arizona eye consultants|tucson|arizona|united states` — added _(2026-05-12)_

---

*Canonical: https://parkinsonspathways.com/agent/trials/NCT04180111.md*  
*Source data (authoritative): https://clinicaltrials.gov/study/NCT04180111*  
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