Visual perception changes and optical stability after intracorneal ring segment implantation: comparison between 3 months and 1 year after surgery
Carregando...
Data
2011
Título da Revista
ISSN da Revista
Título de Volume
Editor
Resumo
Purpose: To prospectively evaluate intracorneal ring segment (ICRS) implantation on quality
of life (QoL) of patients with keratoconus changes and identify factors responsible.
Methods: Sixty-nine eyes of 42 keratoconus patients were implanted with the Keraring
(Mediphacos, Belo Horizonte, Brazil). Best corrected visual acuity (BCVA), refraction, and steep
keratometry were analyzed 3 months and 1 year after surgery. All patients self-administered
the National Eye Institute Refractive Error Quality of life instrument at 2 time points: after
having worn best correction for at least 30 days since evaluation (mean 4 months after surgery)
and 1 year after surgery. To analyze if the use of the appropriate correction at 1 year follow
up had any impact on visual acuity and V-QoL, patients were divided into 2 groups: group A
(appropriate correction) and B (not appropriate correction).
Results: After 1 year, QoL changes related to scales ‘clarity of vision’, ‘near vision’, and
‘far vision’. Keratometric values, sphere, and spherical equivalent did not differ significantly
between 3 months and 1 year postoperative. Cylinder increase was statistically but not clini-
cally significant. Binocular BCVA did not change 1 year after surgery in group A and showed
a clinically significant impairment in group B. A year after surgery, 18 patients did not use
correction suggested by a physician 3 months after surgery. QoL was not statistically different
1 year after surgery between group A and group B.
Conclusion: Our findings show that the way keratoconic patients see is difficult to analyze
using only quantitative and 1-visit metrics. They highlight the importance of patients’ self
perception and performing longitudinal analysis to consider neural compensation to optical
changes from surgery.
Descrição
Palavras-chave
Keratoconus, Quality of life, Cornea
Citação
PARANHOS, Juliane de Freitas Santos et al. Visual perception changes and optical stability after intracorneal ring segment implantation: comparison between 3 months and 1 year after surgery. Clinical Ophthalmology, Eastleigh, v. 5, p. 1057-1062, 2011.