Re-evaluation of scleral reflectivity in quantitative echography — where sclera is examined

Summary

Quantitative echography using A-scan equipment is one of the most effective procedures which have ultrasonic tissue differentiation more precise. In Ossoinig’s method applicable to intraocular membranous structures, level of amplification of echoes from the target tissue is compared with those from the standard tissue, the sclera. The relation between histopatho-logical findings and the value of dB has been investigated by many. However, the sclera as the standard tissue in quantitative echography has been scarcely studied. As the first step the scleral reflectivity was measured as the readings of the sensitivity control dial of the equipment, Kretztechnik 7200 MA, at the time when the peak of the spike reached to the marker line of 50% display height. The measurement was done in four direction of 3, 6, 9, and 12 o’clock meridians. The standard deviation was the smallest in the nasal meridian. No significant difference between the right and left eyes was found statistically in the superior and nasal meridians. From these results is was indicated that the scleral sensitivity in quantitative echography might be measured along with the nasal and superior meridians. To confirm these results the pattern of processed RF signals is to be studied.