Eye Rubbing and Transient Change in Corneal Parameters

Sussex Eye Hospital

Status: Completed

Conditions: Ectasia

Treatments: Other: No eye rubbing; Other: Eye rubbing

Study type: Interventional

Funder types: Other

Identifiers

NCT02131740

140622

Details and patient eligibility

About

This study addresses the research question:

How does eye rubbing affect corneal (clear part of eye) parameters in healthy volunteers

The study objectives are:

1. To determine the corneal changes following eye rubbing
2. To assess tear film changes following eye rubbing
3. To investigate if there is an association between eye rubbing and axial length of the eye.

Full description

Background

A human eye has a front clear window called cornea. This cornea should ideally be spherical but in some subjects, this cornea gets deformed to a cone shape. This cone shaped cornea is called keratoconus. This keratoconus will cause blurring of vision which may require the use of a rigid contact lens or surgical intervention to improve vision. One of the etiological factors for keratoconus is eye rubbing. Eye rubbing is very common in subjects with eczema and other chronic allergic conditions. It is believed that constant eye rubbing every few minutes over years may lead to permanent changes to corneal curvature leading to formation of keratoconus.

It is known from previous studies that eye rubbing causes transient changes in the shape of the clear window of the eye, these changes are returned to baseline at 5 minutes following 1 minute of eye rubbing.

Although clinicians routinely advise such subject to refrain from eye rubbing and prescribe them long term anti allergic medication, there is paucity of scientific evidence on this.

With the knowledge of rubbing induced changes to the clear part of the eye in relation to the axial length we will have a further understanding of those subjects who are more susceptible to moulding and mechanical injury of the clear part of the eye. If we can identify a relationship between eye rubbing and eye length then those subjects with a chronic stimulus to eye-rubbing, such as allergy etc, efforts can be made to protect the eye from rubbing induced changes to prevent disease progression (Keratoconus).

The aim of this study is to assess transient changes (if any) in corneal and surface tear film parameters in healthy volunteers after rubbing of the right eye for 2 minutes. The volunteers will undergo a tear film assessment and a corneal scan before and after eye rubbing on both eyes. In addition to these, the volunteers will also undergo a simple scan (IOLMaster scan) to assess the overall dimension of their eyeballs before eye rubbing. The data from both eyes will be analysed.

Enrollment: 52 patients

Sex: All

Ages: 18+ years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• aged 18 years or above healthy

Exclusion criteria

• aged less than 18 years
• subjects with: terminal illness, poor English language skills or a confused state history of previous ocular problems or surgeries history of contact lens wear not will to undergo simple & quick scans and eye examinations

Trial design

Primary purpose: Diagnostic

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: None (Open label)

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52 participants in 2 patient groups

Eye rubbing intervention

Experimental group

Description:

eye rubbing performed for 1 minute in horizontal direction, clockwise rest for 5 seconds eye rubbing for a further 1 minute

Treatment:

Other: Eye rubbing

No eye rubbing

Active Comparator group

Description:

no eye rubbing - comparator

Treatment:

Other: No eye rubbing