Changes in corneal topography after 25-gauge transconjunctival sutureless vitrectomy versus after 20-gauge standard vitrectomy.
OBJECTIVE
To evaluate the changes in regular and irregular corneal astigmatism after 25-gauge transconjunctival sutureless vitrectomy and 20-gauge standard vitrectomy.


METHODS
Prospective observational comparative case series.


METHODS
Thirty-two eyes of 32 patients undergoing 25-gauge transconjunctival sutureless vitrectomy and 25 eyes of 24 patients undergoing 20-gauge standard vitrectomy.


METHODS
Corneal topography was obtained preoperatively and at 2 weeks and 1 month postoperatively.


METHODS
The dioptric data of the central 3-mm zone of the cornea were decomposed using Fourier harmonic analysis into spherical power, regular astigmatism, asymmetry, and higher-order irregularity.


RESULTS
None of the 4 Fourier indices changed throughout the observation period in the 25-gauge group. In the 20-gauge group, regular astigmatism, asymmetry, and higher-order irregularity were increased significantly at 2 weeks after vitrectomy (P<0.05, Wilcoxon signed-ranks test) and returned to preoperative levels by 1 month. The spherical power in the 20-gauge group did not change after surgery. For regular astigmatism, asymmetry, and higher-order irregularity, the 20-gauge group showed significantly greater surgically induced changes than the 25-gauge group (P<0.05, Mann-Whitney U test).


CONCLUSIONS
Twenty-five-gauge transconjunctival sutureless vitrectomy does not induce significant changes in corneal topography and exerts little influence on the optical quality of the cornea.
Department of Ophthalmology, Institute of Clinical Medicine, University of Tsukuba, Ibaraki, Japan. Fumiki-o@md.tsukuba.ac.jp
F
F
Okamoto
C
C
Okamoto
N
N
Sakata
K
K
Hiratsuka
N
N
Yamane
T
T
Hiraoka
Y
Y
Kaji
T
T
Oshika
D001251:Astigmatism / Q000175:diagnosis / Q000209:etiology*; D003228:Conjunctiva; D003315:Cornea / Q000473:pathology*; D019781:Corneal Topography; D005260:Female; D005583:Fourier Analysis; D006801:Humans; D008297:Male; D008875:Middle Aged; D019060:Minimally Invasive Surgical Procedures / Q000009:adverse effects*; D011446:Prospective Studies; D012164:Retinal Diseases / Q000601:surgery; D013536:Suture Techniques / Q000009:adverse effects*; D014821:Vitrectomy / Q000009:adverse effects*