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Query: EC:6.2.1.1 (ACS)
 78,556 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The article describes the methods for the correction of hypermetropia, i.e. micro-lamellar keratotomy (MLK) and MLK plus thermokeratocoagulation (MLKTKC). The experiment was made on 6 rabbits (12 eyes). Lamellar corneal incisions were implemented by ALK ACS system (USA) to a depth of 73-75% of the corneal thickness. Simultaneously, thermokeratocoagulation (TKC) to 80% of the corneal thickness was made in a part of animals in meridians 6, 8, 10 and 12 (an 8 mm optic zone and 3 to 4 coagulates in each meridian). Postoperatively, the keratometric data were evaluated in 1, 3 and 6 months. The corneal optic power went up, postoperatively, in the center by around 4.0 diopters in cases, when the common surgical technique was used, and it went up to 5.0-9.0 diopters, when the common technique was combined with TKC. A clinical approbation of the MLK and MLKTKC methods in adults with hypermetropia (44 operations, mean age 29.3 years) showed their efficiency and safety. The corneal refraction improvement ranged from 3.5 diopters to 7.5 diopters (mean 4.49 +/- 0.89 diopters). The developed method of the above surgeries (the diameter of the modeled optic zone is 5 mm, the lamellar depth incision is 73%) prevents the complications, which lead to irreversible changes of the cornea; besides, it makes it possible to preserve a sufficiently wide central optic zone with a present refraction. This study provided a foundation for the clinical use of the method in pediatric practice.
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PMID:[Experimental-clinical substantiation of the use of micro-lamellar keratotomy combined with kerato-thermocoagulation in the correction of hypermetropia]. 1367 7

The postoperative refractive error after otherwise successful perforating keratoplasty (PK), often negatively influents the visual acuity.The authors refer about the results of postoperative ametropia correction by means of the LASIK method. There were 43 eyes of 38 patients in the study group. In 41 eyes, there was myopia with myopic astigmatism, and in two eyes, the hyperopia with hyperopic astigmatism were present. The average age of the group was 35.6 +/- 10.5 years (24-87 years), and the follow-up period was 27.4 +/- 22.9 months (maximum, 95 months). The average spherical refractive error before the LASIK procedure was -2.67 +/- 3.66 D, and preoperative subjective astigmatism -5.14 +/- 2.81 Dcyl. The average astigmatism established by means of corneal topography was 5.16 +/- 2.45. Dcyl. LASIK was performed during one session using the excimer laser Keracor 117 (Chiron) or Technolas 217 (Bausch & Lomb). For the lamellar keratectomy the authors used the mechanical LKS (Moria) and the automatic ACS keratome (Chiron). For the corneal topography examination, the ORBSCAN II (Bausch & Lomb) machine was used. The authors evaluated 1) the development of the postoperative refraction, 2) the change of the axis of the astigmatism induced by LASIK, 3) the development of the uncorrected visual acuity (UCVA), 4) the final uncorrected and best-corrected visual acuity (UCVA and BCVA), 5) the change of the endothelial cells' density after LASIK, and 6) the occurrence of per- and postoperative complications. At the last postoperative control, the average of the spherical refractive error was -0.17 +/- 1.01 D, subjective astigmatism was -1.58 +/- 2.03 Dcyl, and topographical astigmatism was 3.62 +/- 2.06 Dcyl (t-test, p < or = 0.001). We reduced the spherical refractive error by 93.6%, subjective astigmatism by 69.3%, and topographical astigmatism by 29.8% only. In 14 eyes (32.6%) the change of the axis was recorded--so called surgically induced astigmatism--the average value was 30.8 +/- 19.8 degrees (t-test, p > or = 0.05). The final UCVA 0.5 and better was reached by 74.4% of eyes (t-test, p < or = 0.001) and BCVA 0.5 and better in 83.8% of eyes (t-test, p < or = 0.05). The postoperative UCVA improved according to the preoperative one in 95.3% of cases, the BCVA in 37.2% of cases (by means of gain of lines on the Snellen chart). During the follow-up period the authors didn't prove statistically significant decrease of the endothelial cells' density (CD) according to the LASIK procedure (t-test, p > or = 0.05). Peroperatively, the authors noticed small defect of the lamella 4 times, and total lamellar detachment 2 times. Postoperatively, in 6 eyes a slight fibrosis occurred, and in two cases, the late rejection of the corneal transplant was diagnosed. The keratoconus relapsed 12 months after the procedure in 2 eyes and was indicated to rekeratoplasty. LASIK is an effective and relatively safe method for postoperative refractive error correction after perforating keratoplasty.
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PMID:[Long-term results of the postoperative ametropia correction after perforating keratoplasty using the LASIK method]. 1822 92