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I Havlíková

Publications and source records attributed to I Havlíková.

6 recordsLinked to original sources
PubMed2004

[Photorefractive keratectomy in hypermetropia].

AIM: To evaluate the results in patients with hypermetropia having undergone photoreactive keratectomy (PRK). GROUP AND METHODS: The authors present a retrospective analysis of the results in 40 eyes operated on PRK in the period of September 1997 to November 2002 at the Eye Clinic of the Faculty Hospital in Hradec Králové. The mean preoperation spherical refraction was 2.90 +/- 0.98 dioptry (D), the mean astigmatism being -0.82 +/- 0.78 D, visual uncorrected visual acuity (NZO) 0.37 +/- 0.37, the mean corrected visual acuity (KZO) 1.28 +/- 0.27). RESULTS: One year after the operation on 31 eyes, the resulting mean spherical refraction was 0.76 +/- 1.10 D, the mean astigmatism being -1.01 +/- 0.80 D, NZO 0.77 +/- 0.18, KZO 0.99 +/- 0.21, NZO 6/12 and better was detected in 94% of surgically treated eyes. CONCLUSION: The PRK method has been found sufficiently effective for the correction of low and medium hypermetropia.

Female↗
PubMed2003

[Corneal surface analysis].

Fourier analysis is a powerful method of evaluating the surface of the cornea. In 50 patients after photorefractive keratectomy included in our study we measured spherical equivalent, regular astigmatism, irregular astigmatism and decentration retrospectively acquired by Fourier series analysis of corneal topography data 1, 3, 6 and 12 months after operation. Postoperative decentration increased significantly from a mean preoperative value. The preoperative and postoperative values are not significantly different. The Fourier spherical equivalent and the values of keratometric spherical (equivalent) are highly correlated. Correlation among decentration, irregular astigmatism and best corrected visual acuity is important for clinical practice. Due to Fourier analysis we obtain information, which could explain worse results of some surgeries.

Astigmatism↗
PubMed2003

[Refractive surgery in myopia up to -6D].

OBJECTIVE: To evaluate the clinical results in patients with myopia up to -6 dioptres (D) after refraction surgery, evaluate their stability and compare photorefractive keratectomy (PRK) and laser in situ keratomileusis (LASIK). MATERIAL AND METHODS: The authors evaluated before and after surgery the refraction values in patients with myopia up to -6 D operated in 1999 and 2000. The patients were subjected to standard examination before operation, one week, 1, 3, 6 and 12 months after operation. The group comprised a total of 542 eyes, 452 PRK eyes and 90 LASIK eyes. RESULTS: After PRK surgery the mean spherical refraction after one year was -0.35 +/- 0.71 D, the mean astigmatism -0.63 +/- 0.38 D, UCVA 0.90 +/- 0.19, BCVA 0.98 +/- 0.11. After LASIK surgery after one year the mean spherical refraction was -0.10 +/- 0.81. D, the mean astigmatism -1.05 +/- 0.65 D, UCVA 0.80 +/- 0.24, BCVA 0.86 +/- 0.21. CONCLUSION: Both methods proved effective and safe for correction of myopia up to -6 D. The results at our clinic are comparable with other departments and are stable in different years. PRK and LASIK achieve equal postoperative results after an interval of 3 to 6 months following surgery.

Astigmatism↗
PubMed2003

[Long-term results of photorefractive keratectomy in myopia up to -6 D].

OBJECTIVE: To present clinical results of patients with myopia up to -6 dioptres (D) after photorefractive keratectomy (PRK) and evaluate their stability during a 4-year period. MATERIAL AND METHODS: The authors evaluated retrospectively the refraction before and after surgery in patients with myopia up to -6 D during the period from September 1997 till December 2000. The group comprised a total of 847 eyes. The mean spherical refraction during the whole follow up period was before surgery -3.61 +/- 1.17 D, the mean astigmatism was -0.65 +/- 0.63 D, non-corrected visual acuity (UCVA) 0.09 +/- 0.09, the visual acuity with optimal correction (BCVA) 1.21 +/- 0.30. RESULTS: One year after PRK we achieved in our group a mean spherical refraction of -0.17 +/- 0.74 D, a mean astigmatism of -0.61 +/- 0.43 D, UCVA 0.92 +/- 0.25, BCVA 1.02 +/- 0.19. CONCLUSION: Photorefractive keratectomy is an effective and safe method for correction of myopia up to -6 D. The results as regards refraction were comparable with other departments and did not differ much during individual years. Stabilization occurs 3-6 months after the operation.

Follow-Up Studies↗
PubMed2003

[Stability of corneal optic power after photorefractive keratectomy].

Changes in the values of optical power of cornea in patients after photorefractive keratectomy (PRK) obtained by Fourier analysis of videotopographic picture of cornea were investigated. The authors compared changes of cornea surface (optical power) in patients with preoperation myopia up to 6 and more than 6 diopters. Moreover, the changes of absolute values of corneal optical power were compared with the development of refraction of the optical system as a whole. In patients with a lower degree of myopia the cornea optical power became stable up to 6 months after the operation. The cornea surface in patients with higher myopia was still changing one year after the operation. The changes of optical power of cornea in patients with a higher myopia were more marked, but the differences were not statistically significant (except for the period after cornea ablation). There was not any significant difference between the changes of objective refraction and the changes of cornea optical power. The main cause of fluctuating postoperative refraction is apparently the change of cornea surface associated with healing of cornea.

Adult↗