Abstract
Purpose:
To evaluate visual, refractive, and topographic outcomes of intracorneal ring segment implantation in relation to the achieved segment depth, using the manual technique.
Setting:
Ophthalmology Department, Hospital de Braga, Braga, Portugal.
Design:
Retrospective cohort study.
Methods:
We obtained 104 eyes of 93 patients with keratoconus submitted to Ferrara intracorneal ring segment (ICRS) implantation, using a manual technique. Subjects were divided into 3 groups according to the achieved depth of implantation: 40% to 70% (Group 1), 70% to 80% (Group 2), and 80% to 100% (Group 3). Visual, refractive, and topographic variables were evaluated at baseline and 6 months. Topographic measurement was performed using Pentacam. Thibos-Horner and Alpins methods were used to analyze the vectorial change of refractive and topographic astigmatism, respectively.
Results:
We found a significant improvement of uncorrected distance visual acuity and corrected distance visual acuity in all groups at 6 months (P < .005); no differences were observed regarding safety and efficacy indexes in the 3 groups (P > .05). Manifest cylinder and spherical equivalent significantly reduced in all groups (P < .05). Topographic evaluation showed a significant improvement of all parameters in the 3 groups (P < .05). A shallower (Group 1) or deeper (Group 3) implantation was associated with topographic cylinder overcorrection, a higher magnitude of error, and a higher mean centroid postoperative corneal astigmatism.
Conclusions:
ICRS implantation with the manual technique showed to be equally effective in visual and refractive outcomes despite the depth of implantation; however, shallower or deeper implants were associated with topographic overcorrection and a higher mean centroid postoperative astigmatism, which explain the lower topographic predictability associated with manual surgery for ICRS implantation.
Publisher
Ovid Technologies (Wolters Kluwer Health)
Subject
Sensory Systems,Ophthalmology,Surgery