EXTRAPALPEBRAL BULBAR COMPRESSION TEST BY USING A SELF—DESIGNED EXTRAPALPEBRAL BULBAR COMPRESSOR AND NONCONTACT TONOMETER (NORMAL VALUE )
Yang Qin-Dau Kuan Yue-Hua Lai Sheng-Hui Dept Ophthalmology JUMC
We have made extrapalpebral bulbar compression tests on 160 normal eyes in 81 patients using a self-designed extrapalpebral compressor. The intraocular pressure was examined by a noncontact tonometer (N C T) .The averages of the intraocular pressure before and after compression were 11.4 turn Hg and 3.46 mm Hg respectively (p0.01) . Therefore, the difference between the intraocular pressure before and after compression was marked. The formula (P_0-P_t)/(p_0)×100% was used to calculate the rate of drop in the intraocular pressure. The average of the intraocular pressure drop was 32.03%. The standard deviation was 5.5%. The range of dropping was 32.3±10.78%. As this method is applied without direct contact to the cornea, it is safe and accurate. we suggest that this method may be used clinically for the detection of open-angle glaucoma.