Correlation Study of Corneal Nerve Changes and Dry Eye in Contact Lens Wearers

Dry Eye Clinical Trial

Official title:

Correlation Study of Corneal Nerve Changes and Dry Eye in Contact Lens Wearers

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT04663529
• Other study ID #: CLADE
• Status: Completed
• Start date: October 1, 2020
• Est. completion date: October 1, 2021

Study information

• Verified date: September 2020
• Source: Peking University Third Hospital
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial Summary

This study aims to analyze the changes of corneal nerve morphology and function in contact lens-related dry eye(CLADE) patients and further discuss the role of corneal nerve in the genesis and development of CLADE.

Description:

33 daily disposable soft contact lens wearers with dry eye disease(DED), 33 DED without contact lens wear and 33 normal control subjects will be involved in study. One experienced ophthalmologist will evaluate the DED symptoms and signs, which include ocular surface disease index(OSDI), tear film breakup time(TBUT), Schirmer Ⅰ test, corneal fluorescein staining, lissamine green staining and meibomian gland dropout rate. After evaluating, corneal sensitivity are measured using a Cochet-Bonnet aesthesiometer. Corneal nerve morphology will be assessed in the right eye using in vivo confocal microscopy(IVCM). Fifteen to twenty minutes after IVCM, 20μL of basal tears will be collected from the inferior meniscus of each participant to test tear neuropeptides. Then investigators analyse the correlation of corneal nerve changes and DED symptoms and signs.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 60
• Est. completion date: October 1, 2021
• Est. primary completion date: May 1, 2021
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 18 Years to 40 Years

Eligibility

Inclusion Criteria:

• Age 18years to 40 years;
• Male or female DED patients based on Chinese Dry Eye Diagnosis Standard (2020) with or without contact lens wear;
• Provision of written informed consent.

Exclusion Criteria:

• Presence of any of the following conditions: active ocular infection, ocular inflammation, active ocular allergy, ocular surgical history, laser treatment in the last 3 months, Meibomian function (MGD) over grade 2 (the grade is according to the report of the International Workshop on MGD in 2011), severe blepharitis or obvious inflammation of the eyelid margin, which in the judgment of the investigator may interfere with the interpretation of the study results
• Pregnant and lactating women, or those planning a pregnancy over the course of the study
• Uncontrolled systemic disease
• Suffer from diseases that may affect corneal nerves, such as keratoconus, trigeminal neuralgia, allergic conjunctivitis, etc.

Related Conditions & MeSH terms

• Contact Lens Complication
• Dry Eye
• Dry Eye Syndromes
• Keratoconjunctivitis Sicca

Intervention

Other:
• contact lens
daily disposable soft contact lens

Locations

Country	Name	City	State
China	Peking University Third Hospital	Beijing	Beijing

Sponsors (1)

Lead Sponsor	Collaborator
Peking University Third Hospital

Country where clinical trial is conducted

China, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	sub-basal corneal nerve density	Sub-basal corneal nerve plexus image will be acquired using a laser scanning confocal microscope. Sub-basal nerve fiber density will be calculated from a manual trace of the length of all nerve fibers in each 1 mm2 image.	baseline
Primary	sub-basal corneal nerve tortuosity	Sub-basal corneal nerve plexus image will be acquired using a laser scanning confocal microscope. Sub-basal nerve tortuosity will be assessed using a grading scale separately by two experienced ophthamologist.	baseline
Secondary	ocular surface disease index(OSDI)	OSDI is one of the most frequently used questionnaires for evaluation of DED. This includes 12 questions which measure the frequency of symptoms over the recent week, and the scores range from 0 to 100.	baseline
Secondary	Tear break-up time (TBUT)	TBUT is the time from normal blinking to the first appearance of a break in the tear film.	baseline
Secondary	Schirmer ? test (S?t)	The Schirmer I test is performed using sterile strips without anesthesia. The strips are placed in the lateral part of the inferior fornix of the eye for 5min and the extent of tear flow down was measured in millimeters.	baseline
Secondary	Corneal fluorescein staining	The degree of fluorescein staining of the cornea was evaluated using the National Eye Institute (NEI) scale of five corneal regions (central, superior, temporal, nasal, and inferior).	baseline
Secondary	Lissamine green staning	To grade the temporal zone, the subject looks nasally; to grade the nasal zone the subject looks temporally. The upper and lower conjunctiva can also be graded.	baseline
Secondary	meibomian gland droupout rate	meibomian gland evaluation	baseline
Secondary	corneal sensitivity	Corneal sensitivity will be measured in the right eye only using the Cochet-Bonnet aesthesiometer and the ascending method of limits to determine the threshold of stimulus detection.	baseline
Secondary	the concentration of substance P	20µL of basal tears will be collected from the inferior meniscus of each subject to test substance P. Substance P levels will be quantified by competitive enzyme-linked immunosorbent assays.	baseline
Secondary	the concentration of CGRP	CGRP levels will be quantified by competitive enzyme-linked immunosorbent assays.	baseline