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Reliability of Tear Meniscus Height Measurements in Contact Lens Wearers and Its Relationship With Discomfort
Laura Valencia-Nieto1, Alberto López-de la Rosa, Alberto López-Miguel
1Instituto de Oftalmobiología Aplicada (IOBA) (L.V.-N., A.L.-R., A.L.-M., M.J.G.-G.), Universidad de Valladolid, Valladolid, Spain; Departamento de Física Teórica (L.V.-N., A.L.-R., M.J.G.-G.), Atómica y Óptica, Facultad de Ciencias, Universidad de Valladolid, Valladolid, Spain; Departamento de Cirugía (A.L.-M.), Oftalmología, Otorrinolaringología y Fisioterapia, Facultad de Medicina, Universidad de Valladolid, Valladolid, Spain; and Biomedical Research Networking Center in Bioengineering (M.J.G.-G.), Biomaterials and Nanomedicine (CIBER-BBN), Valladolid, Spain.
Objectives:
To evaluate the reliability and agreement of tear meniscus height (TMH) measurements performed with a corneal analyzer and optical coherence tomography (OCT) technology in contact lens (CL) wearers and its correlation with contact lens discomfort symptoms.
Methods:
Asymptomatic and symptomatic CL wearers classified through the Contact Lens Dry Eye Questionnaire-8 were evaluated with the Corneal Analyzer (Topcon CA-800) and OCT technology (Topcon 3D OCT-2000). The repeatability and intraclass correlation coefficient (ICC) were calculated. The agreement between devices was calculated using the Bland-Altman method. The relationship between TMH measurements and the Contact Lens Dry Eye Questionnaire-8 and Contact Lens Discomfort Index scores was assessed through the Spearman correlation coefficient.
Results:
Seventy-nine asymptomatic and 42 symptomatic CL wearers aged 34.24±12.50 years were enrolled. The repeatability values obtained for the CA-800 were 0.07 mm in all cases, and the ICC was 0.93 for the whole sample. The CA-800 provided significantly ( P <0.01) higher TMH values than the OCT for the whole sample (0.22±0.08 vs. 0.17±0.06 mm). A weak indirect correlation (ρ=-0.22) between the OCT TMH measurement and Contact Lens Discomfort Index scores was found ( P ≤0.04).
Conclusion:
The CA-800 provides reliable TMH measurements during CL wear; however, they might not be interchangeable with OCT ones. Tear meniscus height measurements might be useful as a complementary sign to detect CL discomfort, but it cannot be used alone as a diagnostic tool.
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