Official ESCRS | European Society of Cataract & Refractive Surgeons

Spectral-domain optical coherence tomography lower tear meniscus measurements following conventional and femtosecond laser In situ keratomileusis

Session Details

Session Title: Refractive
Session Date/Time: Sunday 22/02/2015 | 08:30-11:00
Paper Time: 09:03
Venue: Sadirvan A
First Author: : A.Dahab EGYPT
Co Author(s): :    M. Khafagy   N. Shaban   R. Hatata   P. Foaad     

Abstract Details


To assess LASIK associated dry eye after measuring the lower tear meniscus using spectral-domain optical coherence tomography (SD-OCT) in conventional (Microkeratome) and femtosecond (Intralase) assisted laser in situ keratomileusis (LASIK) for myopia.


Maghrabi Eye Hospital, Main Branch, Cairo, Egypt.


A total of 30 patients were recruited in the study; 15 patients undergoing intralase femtosecond LASIK and 15 patient s having conventional Lasik using the Moria II microkeratome. One eye per patient was chosen randomly prior to surgery and followed-up in the study. The height (LTMH) and area (LTMA) of the lower tear meniscus were obtained using the Optovue SD-OCT (RTvue 100) before surgery, 1 week, 1 month, and 3 months after surgery for each patient. At each visit, Schirmer’s test (type I, without anesthetic), tear break-up time (TBUT), and dry eye symptoms were also evaluated.


In all patients, the mean LTMH and mean LTMA were significantly decreased from the preoperative values on the first two postoperative visits (P < 0.05), and returned to the mean preoperative values by the 3rd month (P > 0.05). Postoperative mean Schirmer’s and TBUT values were not different from the preoperative values in all visits (P > 0.05). On analysis of the dry eye symptoms, most patients reported improvement on the 3rd visit. On subgroup analysis, no significant difference was detected between the intralase group and Microkeratome group in all of the parameters examined at each visit (P > 0.05).


The lower tear meniscus parameters measured by anterior segment SD-OCT could be a more sensitive tool to evaluate post-LASIK dry eye than the conventional clinical tests. No significant differences were detected in LTMH or LTMA between the femtosecond LASIK and Microkeratome LASIK groups.

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