What is the normal value for the Schirmer's test I?

Dec 09, 2022 Source: Cainiu Health

Dr. Cui Xin

Introduction

The tear secretion test is an examination for excessive tear production. If the test result is greater than 25 mm in adults or greater than or equal to 10 mm in elderly individuals, it indicates excessive tear secretion, which is often associated with lacrimal gland hyperactivity. Patients may suffer from diseases such as conjunctivitis, blepharitis, lower eyelid eczema, dry eye keratoconjunctivitis, vernal conjunctivitis, epidemic keratoconjunctivitis, or other similar conditions.

The Schirmer I test determines results by measuring the wetting length of a filter paper strip. The normal value for adults is 10–25 mm, while for elderly individuals it is less than 10 mm.

The tear secretion test is used to evaluate excessive tear production. In adults, a test result greater than 25 mm, or in elderly individuals a result of 10 mm or more, suggests excessive tear secretion, often associated with lacrimal gland hyperactivity. Patients may suffer from conditions such as conjunctivitis, blepharitis, lower eyelid eczema, dry keratoconjunctivitis, vernal conjunctivitis, epidemic keratoconjunctivitis, or other related diseases. If test results are abnormal, there may be changes in the quantity or characteristics of ocular discharge. Such patients often experience clinical symptoms including blurred vision and difficulty opening the eyes upon waking.

This examination includes assessment of lacrimal gland secretory function to determine whether excessive tear secretion is present. It also includes evaluation of the lacrimal drainage pathway. If mucus or purulent discharge flows back from the lower punctum, chronic dacryocystitis may be suspected. If bloody discharge is observed, a malignant tumor of the lacrimal sac may be indicated.

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