2017 Volume 38 Issue 3 Pages 66-71
Purpose: We investigated what kind of fitting adjustment was necessary for Progressive Addition Lens (PAL) improperly fitting example. In addition, we investigated whether improvement of defects by adjustment of fitting can be objectively evaluated.
Methods: The subjects were 137 people who prescribed PAL and who had a fitting defect among patients who had consult again from May 2015 for one year. In that three subjects, we measured objective refraction by SpotTM Vision Screener (Spot vision) before and after the fitting adjustment under PAL wear, and the spherical equivalent (SE) was compared.
Result: 84 people required adjustment of the vertex distance, and also 84 people who required adjustment of the distance fitting point (DFP). Among them, the mean SE of 6 eyes was significant before -0.56±0.44 D, after adjustment -0.33±0.47 D (t test, p=0.0001).
Conclusion: When complaining of PAL trouble, it is important to check the vertex distance and DFP. In addition, it was suggested that spot vision is useful for objective evaluation of improperly fitting cases.
