[Computerized video-keratoscopic analysis and cataract surgery by phacoemulsification. Predictive calculation of the power of the intraocular implant].
OBJECTIVE
The authors present the results of a prospective study of 125 consecutive cases of phacoemulsification, performed by a single surgeon, to assess the benefit of computerised videokeratoscopy for the improvement of the predictive calculation of the power of intraocular lenses (IOL).


METHODS
Preoperative keratometry was determined by means of 3 concurrent techniques, including automated kerato-refractometry (AKR 2000, Nidek) and videokeratoscopy by TMS-1 (Tomey) and CAS-1 (EyeSys). The results of the IOL calculation by these 3 methods was compared postoperatively to the power of the actual IOL yielding emmetropia as calculated by the optical method based on the postop, refraction at the various time-points.


RESULTS
Simulated values obtained with videokeratoscopy significantly reduced the refractive error at 1 postop, week (p = 0.001), one month (p = 0.002) and 3 months (p = 0.002) for the CAS1 and at 3 months (p = 0.002) for the TMS1, as compared to values obtained with conventional automated keratometry. The refractive error was significantly reduced with the CAS1 at one month (p = 0.001) and 3 months (p = 0.019) as compared to TMS1.


CONCLUSIONS
The determination of the anterior curvature of the entrance pupil by videokeratoscopy significantly improves the predictive calculation of the IOL power.
Assouline
M
M
Département d'Ophtalmologie, Hôtel-Dieu, Paris.
Briat
B
B
Kaplan-Messas
A
A
Renard
G
G
Pouliquen
Y
Y
D000368:Aged; D001699:Biometry; D002387:Cataract Extraction / Q000379:methods*; D003315:Cornea; D001330:Electronic Data Processing; D006801:Humans; D007910:Lenses, Intraocular; D009887:Ophthalmoscopy; D018918:Phacoemulsification; D011446:Prospective Studies