Posters

Utility of crystal toric mobile app in the marking of corneal axis

Poster Details

First Author: J.Folch Ramos SPAIN

Co Author(s): R. Salvador   P. Blasco Posa   M. Cipres Palacin              

Abstract Details

Purpose:

To compare the degree of correspondence discrepancy in corneal axis marking between classical slit lamp manual marking and crystal toric application

Setting:

Germanes Hospitalaries Del Sagrat Cor De Jesus Hospital Sant Rafael Barcelona

Methods:

Prospective study in 100 eyes (50 right and 50 left) of 50 patients attended at the office. We marked at slit lamp the horizontal axis (180) in half of each group and an oblique axis (135 for right eyes and 45 for left eyes) in the other half and we compared those axes with those suggested by crystal toric app We calculated the degree of discrepancy between the two measuring systems and also whether the possible differences between the horizontal and the oblique group measurements were statistically significant

Results:

Mean angular deviation between both measurement systems was 2.34 degrees ± 0.69 (1.12 ± 0.38 for horizontal axis and 3.56 ± 0.77 for the oblique) proportion of individuals with a discrepancy greater or equal to 3 degrees in the horizontal measurement was 22% (± 12%) while 58% (± 14%) in the oblique one. this proportion descended to 2% (± 3%) and 30% (± 13%) respectively if we use a threshold greater or equal to 5 degrees. In both cases horizontal oblique differences were statistically significant (chi squared test p value 0.05)

Conclusions:

Crystal toric application may be a good tool for corneal axis marking previous to toric lens implantation. Differences observed between the horizontal and the oblique groups measurements lead us to think that it could be due to mistakes in manual marking as it is more difficult to perform this hands up marking in the oblique axis. Comparative studies with nowadays gold standard techniques (callisto verion) would be advisable in order to confirm data observed in this work

Financial Disclosure:

... gains financially from competing product or procedure, ... travel has been funded, fully or partially, by a company producing, developing or supplying the product or procedure presented, ... research is funded, fully or partially, by a company producing, developing or supplying the product or procedure presented, ... receives non-monetary benefits from a company producing, developing or supplying the product or procedure presented, ... receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented, ... is employed by a competing company, ... has significant investment interest in a company producing, developing or supplying product or procedure presented