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Objective optical assessment of tear-film quality dynamics in normal and mildly symptomatic dry eyes.

Abstract：

PURPOSE:To evaluate and compare the tear-film dynamics in normal eyes and in eyes with mild dry-eye symptoms using a new noninvasive optical method based on a double-pass instrument. SETTING:Hospital Universitario Virgen de la Arrixaca, Murcia, Spain. DESIGN:Evaluation of diagnostic test or technology. METHODS:Dynamic recording of double-pass retinal images during unforced tear-film breakup was performed in eyes with mild dry-eye symptoms (study group) and in an asymptomatic control group. Series of consecutive retinal images were recorded every 0.5 seconds while the patient avoided blinking. Measurements were performed under low-light conditions to naturally increase pupil diameter and maximize the method's sensitivity. Additional clinical tests were performed for comparison and included tear breakup time (TBUT), Schirmer I tests, and a normalized questionnaire (McMonnies). From the retinal images, a quality metric, the intensity distribution index, was calculated. An objective TBUT value was estimated in each eye when the intensity distribution index surpassed a defined threshold value compared with the initial baseline. RESULTS:The study group comprised 20 eyes and the control group, 18 eyes. Symptomatic dry eyes had a typical exponential increase in the intensity distribution index with time. The objective TBUT values in the study group were comparable to the clinical TBUT estimates. CONCLUSIONS:The new objective optical method to evaluate the quality and stability of the tear film was sensitive in detecting mild symptoms of dry eye and differentiating from normal cases. The procedure may allow early detection and follow-up of patients' tear film-related complaints.

journal_name

J Cataract Refract Surg

journal_title

Journal of cataract and refractive surgery

authors

Benito A,Pérez GM,Mirabet S,Vilaseca M,Pujol J,Marín JM,Artal P

doi

10.1016/j.jcrs.2011.03.036

subject

Has Abstract

pub_date

2011-08-01 00:00:00

pages

1481-7

issue

8

eissn

0886-3350

issn

1873-4502

pii

S0886-3350(11)00732-2

journal_volume

37

pub_type

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