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.
Okamoto
F
F
Department of Ophthalmology, Institute of Clinical Medicine, University of Tsukuba, Ibaraki, Japan. Fumiki-o@md.tsukuba.ac.jp
Okamoto
C
C
Sakata
N
N
Hiratsuka
K
K
Yamane
N
N
Hiraoka
T
T
Kaji
Y
Y
Oshika
T
T
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*