Head office(Shirakawa Factory)
1-2 Shinnatunashi, Shirakawa-shi, Fukushima 961-0024, JAPAN
Tokyo office
6-24-14 Umeda, Adachi-ku, Tokyo 123-0851, JAPAN
TEL +81-3-3880-0455

 Shirakawa factory




A new method for

Tear Volume Measurement





5 seconds

Dry eye screening 

Five seconds quantification for the lower tear meniscus volume




・ISO 13485:2003, ENISO13485:2012 certified
・Medical devices manufacturer licensed by MHLW Japan
・MHLW third-class medical devices marketing authorization holder
・FDA registration



The tear film stability is closely related to the tear volume. Thus, the tear volume is an important parameter to conduct tear-film-oriented-therapy properly, where the treatment of dry eye disease or the postoperative care for refractive and cataract surgeries are typical examples of such.


We would like to introduce our new diagnostic medical device, “Strip Meniscometry Tube (SMTube)”, developed for a simple, accurate, swift and minimally-invasive assessment of tear volume. “Strip Meniscometry” is a term of a methodology for the tear volume evaluation, of which the original paper was published in 2006 (Dogru 2006). Then in 2011, it has been reported that the strip meniscometry testing was useful in the diagnosis of dry eye disease, showing a statistically significant correlation with other ocular surface examinations such as the Schirmer test, tear film breakup time measurement, and vital staining scores (Ibrahim 2011).


“SMTube” is a product to perform the strip meniscometry testing, developed with an appropriate standardization and mass-production techniques, with intent to help medical staff carry out the testing with ease and accuracy.


All you do is to immerse the tip of the SMTube strip into the tear meniscus of the lower eyelid for 5 seconds. And column will be stained with blue dye as the SMTube absorbs tears. The length of stained column quantifies the tear meniscus volume.

Since SMTube is used right on ocular surfaces, the safety is highly considered; The material and structure were carefully chosen and designed so that no damage ought to occur on the ocular surface in case the tip of the strip touches cornea or conjunctiva.


A number of reports have been published in terms of the use of SMTube in their clinical studies (please see the reference papers on page 9 of this brochure).


Here are some of the examples :

1. Quantitative measurement of tear meniscus volume during visual field testings using SMTube (Sagara 2015)

2. An efficacy of SMTube testing in a mass screening of dry eye disease during regular medical checkup (Ishikawa 2016)

3. A clinical efficacy of SMTube in the diagnosis of dry eye disease when combined with OCT examinations (Shinzawa 2017)







Please click here to find the documents related to SMTube


or Contact us here for any inquiry