Dr. Snober Yousuf, Y13889, Dr. Monica Gandhi, Dr. Manisha Agarwal, Dr. Dubey Suneeta
Purpose -To evaluate the reliability of low frequency B scanner in detecting optic nerve head cupping and correlating it with clinical findings.
Method – A prospective, single blinded , cross sectional investigational study was designed. The study included patients posted for surgery in whom the optic disc evaluation was not possible due to media opacity.Patients with clear media and glaucomatous optic nerve head where the disc could be clinically evaluated were included to validate B scan findings. Ultrasonography was performed by a single investigator unaware of the clinical findings.
Result-A total of 371 subjects participated in this study.B scan findings were documented as presence or absence of optic nerve head cupping and later on correlated with clinical findings. In 371patients,cupping was present in 230 patients and B scan predicted it accurately in 190 patients (82.6 %).
The sensitivity of B scan in predicting optic nerve head cupping was found to be 83% (95% CI 0.80-0.90) and specificity of 100% (95% CI 0.97-1).
Conclusio