Influence of Age on Corneal Deformation Parameters

Friday, April 17, 2015
KIOSKS (San Diego Convention Center)
Bruno F. Valbon, MD
Milton R. Alves, MD, PhD
Allan Luz, MD
Bruno M. Fontes, MD, PhD
Marcella Salomão, MD
Renato Ambrósio Jr, MD, PhD

Purpose
To evaluate the influence of age on corneal deformation parameters during non-contact tonometry in healthy eyes.

Methods
Observational, retrospective study involving one eye randomly selected from 89 healthy patients matched for CCT and IOP. Age groups were defined: 10-30 years-old (yo); 31-50 yo; 51-70yo; 71-90yo. Non-contact Tonometry wiuth ultra-high-speed (UHS) Scheimpflug imaging (Oculus Corvis ST; Wetzlar, Germany) was performed in all cases. Kruskall-Wallis test was used to evaluate the difference among the different age groups. The regression multiple analysis was also applied.

Results
Mean patient age was 49.09 ± 21.82 years. The mean of  IOP and CCT were same in all groups. The parameters from Corvis ST:1st Applanation Time, 2nd Applanation Time, 1st Applanation Length, curvature radius at highest concavity and ingoing velocity (Vin) had significant differences among the age groups. Using a multiple regression analysis, a combined paramter had correlation coeficient of 0.834 with age.

Conclusion
There is influence of age in some parameters derived from Corvis ST independently from IOP and CCT