Reproducibility of Retinal Nerve Fiber Layer Thickness Measurements Using the Eye Tracker and Retest Function of Spectralis® SD-OCT in Glaucomatous Eyes and Healthy Controls

PURPOSE. To evaluate the impact of self-acting eyetracking and retest software on the reproducibility of retinal nerve fiber layer (RNFL) thickness measurements in glaucoma patients and healthy control subjects using Spectralis® SD-OCT.

METHODS. RNFL thickness was measured in 56 normal and 47 glaucomatous eyes by one operator within one session with a brief rest between measurements. Three measurements were taken with the eye-tracker and retest function, and three were taken without this function, alternating between measurement methods.

• Trial with medical device

Inclusion criteria:

• Visual acuity of more or equal to 0.5 Snellen, refractive error less than ±5.00 diopters (D) spheric and ±3.00 D cylindrical and no history of ocular trauma or of any other severe ocular disease (particularly diseases affecting the optic nerve or surgery other than uncomplicated cataract surgery).
• Additional inclusion criteria for the glaucoma group were a diagnosis of primary open angle glaucoma (POAG) or PEX-glaucoma.

Exclusion criteria:

• Exclusion criteria for the control group were history of glaucoma or intraocular pressure beyond 21 mmHg and optic disc cupping of more than 0.6