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Prachi Kumar,Rahul Bhargava,Manoj Kumar,Somesh Ranjan,Manjushri Kumar,Pratima Verma 대한안과학회 2014 Korean Journal of Ophthalmology Vol.28 No.2
Purpose: To establish the strength of the association between routine tear function tests and conjunctival impressioncytology (CIC) and to determine whether they simulate the morphological and cytological changesthat occur on the ocular surface in dry eye. What are the sensitivity, specificity and positive predictive valuesof these tests when CIC is considered the gold standard?Methods: The tear film profile included tear film break up time (TBUT), Schirmer’s-1, Rose Bengal scores (RBS),and impression cytology. CIC samples were obtained from the inferior bulbar conjunctiva and stained withperiodic acid-Schiff and counter stained with hematoxylin and eosin. Results: The mean Schirmer’s value was 11.66 ± 5.90 in patients and 17.17 ± 2.97 in controls (p < 0.001). Themean TBUT in participants was 8.88 ± 3.54 and 13.53 ± 2.12 in controls (p < 0.001). Patients had a meangoblet cell density (GCD) of 490 ± 213, while the value for controls was 1,462 ± 661 (p < 0.001). Abnormal CICwas observed in 46.7% cases of dry eye and in 32.8% of controls. The correlation coefficient (L) for Schirmer’swas 0.2 and 0.24 for participants and controls, respectively, while TBUT values were 0.26 and 0.38, RBSwere 0.5 and 0.5, and GCD was 0.8 and 0.6 in cases and controls, respectively. Conclusions: GCD, RBS, and TBUT were better predictors of morphological and cytological changes in theconjunctiva than Schirmer’s in dry eye syndrome. The sensitivity of tear function tests in diagnosing dry eyewas TBUT > Schirmer’s > RBS, and the specificity was Schirmer’s > TBUT > RBS in decreasing order whenCIC was considered the gold standard.