Ultrasound velocities for axial eye length measurement.

  title={Ultrasound velocities for axial eye length measurement.},
  author={Kenneth J. Hoffer},
  journal={Journal of cataract and refractive surgery},
  volume={20 5},
Since 1974, I have used individual sound velocities for each eye condition encountered for axial length measurement. The calculation results in 1,555 M/sec for the average phakic eye. A slower speed of 1,549 M/sec was found for an extremely long (30 mm) eye and a higher speed of 1,561 M/sec was noted for an extremely short (20 mm) eye. This inversely proportional velocity change can best be adjusted for by measuring the phakic eye at 1,532 M/sec and correcting the result by dividing the square… CONTINUE READING