Scheimpflug Imaging Parameters in Keratoconus Patients Without Treatment: 2-Year Follow-up
Narrative Responses:
Purpose
To evaluate Scheimpflug imaging parameters and demographic information in patients with keratoconus diagnosis, that did not have any treatment during a follow up of 2 years.
Methods
This retrospective study included 19 eyes with keratoconus diagnosis that didn’t have any treatment during 2 years follow up. Demographic data, visual acuity, manifest refraction and Scheimpflug parameters using the Galilei ( Ziemer Ophthalmic System) were compared between first visit and after 1 and 2 years. The eyes were grouped in three groups: Group A, increase in the maximum keratometry values bigger than 1 Diopter (D) in one year, group B decrease in maximum keratometry of 1 D or more in 1 year and group C not changes in keratometry or changes were lower than 1 D in 1 year.
Results
Group A showed an increase in maximum keratometry of 1.9D at 2 years of follow up (p=0.03); maximum posterior elevation showed a mean increase of 5.7 um (Standard deviation [DS]= 7.68 um) at 2 years of follow up (p = 0.04). Group B showed a mean decrease in maximum keratometry of 1.2 D (DS= 1.1D) at 2 years of follow up (p= 0.04). Group C showed mean change on maximum keratometry of 0.4D (p=0.07). There was not statistically significant difference on best corrected visual acuity (BCVA) during the follow up in all groups (p> 0.05 all).
Conclusion
Untreated keratoconus can show different evolution. The most significant change on tomographic parameters in keratoconus progression was the maximum keratometry values followed by posterior elevation values.