Pentacam Scheimpflug evaluation of corneal volume after LASIK.
OBJECTIVE
To assess the change in corneal volume and laser ablation volume over time after LASIK using a rotating Scheimpflug camera.


METHODS
Twenty-six patients (49 eyes) underwent LASIK. Pentacam Scheimpflug measurements were performed pre- and postoperatively at 1, 3, 7, 15, and 30 days. Central corneal thickness, total corneal volume (10-mm diameter), and partial corneal volumes (3, 5, and 7 mm) based on the apex of the cornea, were measured. Main outcome measures were differences between pre- and postoperative volume measurements of total and partial corneal regions, volume changes over time postoperatively, and comparison between laser ablation volume and corneal volume.


RESULTS
A strong linear relationship was noted between spherical equivalent refraction and laser ablation volume (r = -0.931, P < .0001). Furthermore, 30 days after LASIK, a strong linear relationship was noted between planned thickness and achieved thickness (r = 0.9457, P < .001). Corneal volumes for 3-, 5-, and 7-mm diameter regions significantly decreased over time postoperatively (one-way analysis of variance, P < .05).


CONCLUSIONS
Alterations in corneal volume correlated with laser ablation volume when the diameter of the region considered was 3, 5, or 7 mm from the corneal apex.
Diniz
Camila M Gadelha R
CM
From Vision Institute, Federal University of São Paulo, Department of Ophthalmology, São Paulo, Brazil. camilamg@oftalmo.epm.br
Hazarbassanov
Rossen M
RM
Yamazaki
Ester
E
Murata
Celina
C
Mallmann
Felipe
F
Campos
Mauro
M
D000328:Adult; D000886:Anthropometry; D001251:Astigmatism / Q000601:surgery*; D003315:Cornea / Q000473:pathology*; D003941:Diagnostic Techniques, Ophthalmological; D006801:Humans; D020731:Keratomileusis, Laser In Situ / Q000379:methods*; D054018:Lasers, Excimer / Q000627:therapeutic use*; D008875:Middle Aged; D009216:Myopia / Q000601:surgery*; D010781:Photography / Q000379:methods; D011446:Prospective Studies