Its All About the Bump

Background: Handheld digital devices such as cell phones and tablets have changed the
visual demands of students and working adults. Extended near work can cause visual
symptoms such as discomfort or tired eyes. Lenses have been introduced to the market
that help relieve visual fatigue for pre-presbyopes. Methods: In this study, examiners
used the Rotlex Class Plus analyzer to evaluate four styles of fatigue reducing spectacle
lenses, each with a different "bump" in add power. Three distance powers of each style of
lens were masked, and analyzed by each student with the Rotlex analyzer and a
lensometer. Results: Each style and power oflens was analyzed for varying
characteristics such as the area of the full add power, the characteristics of the transition
zone, and the distance between the optical centers. Conclusions: This information will
provide eye care practitioners with more data on fatigue reducing lenses, which will help
determine which lens is most appropriate for each patient.