Objective: We try to study the validity and reliability of grading standard of oblique flashlight test in this paper.

Methods: The validity of the grading standard of the oblique flashlight test was evaluated in 251 eyes. Based on anterior chamber angle as the gold standard, different grades of oblique flashlight test can find capable of closure angle sensitivity and specificity. The reliabilities (interobserver agreement and intraobserver agreement) also were evaluated in 250 and 88 eyes.

Results: 1. Validity of grading standard of oblique flashlight test: the results showed that it can find capable of closure angle sensitivity is 96.67%, specificity is 74.53% and Youden's index is 0.712, when the grades cutoff point on grade II. 2. Reliability of grading standard of oblique flashlight test: the results showed that the intraobserver agreement was observed agreement (Po) = 0.8, Kappa value (K) = 0.74 , Z = 22.48 and the intraobserver agreement was Po = 0.909, K = 0.875, Z = 16.08.

Conclusions: The results of this research showed there are satisfactory validity and reliability for grading standard of oblique flashlight test. The test may be applied widely to estimate shallow anterior chamber and narrow angle.