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Evaluation of dynamic corneal densitometry and the new CorvisST parameters after SMILE

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Session Details

Session Title: Corneal Biomechanics

Session Date/Time: Monday 09/10/2017 | 08:00-10:30

Paper Time: 09:45

Venue: Room 2.1

First Author: : J.Fernández SPAIN

Co Author(s): :    M. Rodriguez-Vallejo   J. Martinez   A. Tauste   P. Salvestrini   D. Pinero        

Abstract Details


To evaluate the new Corvis ST (CoST) parameters and dynamic corneal densitometry (CD) in eyes operated on small incision lenticule extraction (SMILE).


Department of Ophthalmology (Qvision), Vithas Virgen del Mar Hospital, Almería, Spain


43 subjects/eyes from a single institution were included in the statistical analysis. Preoperative and one month postoperative measures with CoST in SMILE were taken. The dynamic CD and the new parameters of the CoST software (1.3r1469) were evaluated, including: normal (IOP) and biomechanically corrected (bIOP) intraocular pressures and stiffness parameter at first applanation (SP-A1).


Mean differences before and after surgery were 2.24 ± 1.26 mmHg for IOP (p = 0.001) and 0.57 ± 1.77 mmHg for bIOP (p = 0.04). All the new parameters changed after SMILE (p<0.05) and the variation of each one was correlated with the removed corneal thickness (p<0.05) except for SP-A1 (p=0.15). None of the four CD parameters changed significantly due to the surgery. A new sign described as a brightness fringe moving through corneal periphery appeared preoperatively in eyes with higher dynamic CD. The prevalence of this sign was increased from 48.8% to 72.1% (p = 0.04) after SMILE.


The postoperative bIOP measured with the new CoST shows better agreement with the preoperative values than IOP. SP-A1 is not dependent of removed corneal thickness. An interesting new sign correlated with dynamic CD that might be related with changes in corneal hydration and biomechanics has been reported.

Financial Disclosure:

receives consulting fees, retainer, or contract payments from a company producing, developing or supplying the product or procedure presented, travel has been funded, fully or partially, by a company producing, developing or supplying the product or procedure presented

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