Horizontal vs. Vertical Positioning of the iCare Rebound Tonometer and Effects on Intraocular Pressure Readings

The University of Texas System (UT)

Status: Completed

Conditions: Intraocular Pressure

Treatments: Other: Horizontal iCare; Other: Vertical iCare

Study type: Interventional

Funder types: Other

Identifiers

NCT02837536

HSC-MS-16-0396

Details and patient eligibility

About

The goal of this study is to evaluate the agreement between intraocular pressure (IOP) measurements taken by iCare, held in both vertical and horizontal positions. In addition, iCare measurements will be compared against pneumotonometry measurements to assess for accuracy.

Enrollment: 107 patients

Sex: All

Ages: 18+ years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• 18 years of age or older
• Must be able to understand and sign and informed consent form that has been approved by an Institutional Review Board/Ethics Committee

Exclusion criteria

• Evidence of corneal epithelial defects or pathology affecting corneal rigidity
• Use of topical ophthalmic medications (except for artificial tears)
• History or corneal surgeries
• Any condition that would prevent or inhibit intraocular pressure measurements using iCare or pneumotonometry
• Evidence of ocular infection 30 days prior to enrollment
• Allergy to proparacaine or latex

Trial design

Primary purpose: Diagnostic

Allocation: Randomized

Interventional model: Crossover Assignment

Masking: None (Open label)

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107 participants in 2 patient groups

Horizontal iCare

Active Comparator group

Description:

In the horizontal iCare arm, these patients were randomized to have their IOP measured with the iCare tonometer held in the horizontal position first and then their IOP measured with the iCare tonometer held in the vertical position.

Treatment:

Other: Vertical iCare

Other: Horizontal iCare

Vertical iCare

Active Comparator group

Description:

In the vertical iCare arm, these patients were randomized to have their IOP measured with the iCare tonometer held in the vertical position first and then their IOP measured with the iCare tonometer held in the horizontal position.

Treatment:

Other: Vertical iCare

Other: Horizontal iCare