Posts from July, 2010
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Jul0Corrective Vision for 30 to 50 year olds!
Eyesight correction during your 30s could end up being liberating regardless of whether you are exploring the world, working hard on your career, beginning a family or perhaps purchasing a house. Take a moment to visualize what it could be like to: Acquire freedom from glasses or contacts – no more being concerned concerning cleansing [...]
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22
Jul0Accuracy and Precision of LASIK Flap Thickness Using IntraLase: Part 7
The intraoperative complication rate in this series is low. There were no buttonholes, partial flaps, loss of suction mandating cessation of treatment, nor was any patient unable to have the flap elevated. In the early stages, adjustments were made to the bed and sidecut energy to facilitate flap elevation, and subsequent changes were made when the upgrade to the 30-KHz translational speed occurred
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21
Jul2Accuracy and Precision of LASIK Flap Thickness Using IntraLase: Part 6
The predictability of fl ap thickness in our series is similar to others using the IntraLase femtosecond laser, and compares favorably with all studies utilizing a mechanical microkeratome. In this study, 79.2% of patients treated with the 15-KHz had a corneal flap within 20 μm of intended, which was increased to 98.6% with the 30-KHz laser. It is not possible to conclude this difference is purely due to the increased translational speed of the 30-KHz unit. Although both groups were analyzed prospectively, this was not a randomized study,
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20
Jul0Accuracy and Precision of LASIK Flap Thickness Using IntraLase: Part 5
A number of clinical case series of LASIK results utilizing the IntraLase femtosecond laser have been reported. With the exception of Binder et al,8 the literature reports relatively small case series, and those that made a comparison with mechanical microkeratomes differed as to whether IntraLase provides a clear benefit in terms of safety and predictability.
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19
Jul0Accuracy and Precision of LASIK Flap Thickness Using IntraLase: Part 4
No sight-threatening intra- or postoperative complications were seen. Three (0.3%) patients had epithelial defects requiring a bandage contact lens. Four (0.4%) patients had slipped caps on day 1 that required repositioning. Two (0.2%) patients developed grade I DLK. No patient developed DLK grade II, epithelial ingrowth 1 mm from the flap edge, or transient light sensitivity. No infections were noted.
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18
Jul0Accuracy and Precision of LASIK Flap Thickness Using IntraLase: Part 3
A subgroup of 260 eyes was prospectively analyzed to assess the predictability of flap thickness. The subgroup was composed of 119 and 141 eyes treated with the 15-KHz and the 30-KHz laser, respectively. The intended fl ap thickness for all patients undergoing the procedure using the 15-KHz and 30-KHz laser was 105 and 115 μm, respectively. The intended flap thickness used for both units was according to the manufacturer recommendations and was not changed throughout the review period.
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17
Jul0Accuracy and Precision of LASIK Flap Thickness Using IntraLase: Part 2
Prior to the IntraLase procedure, a single drop of Minims oxybuprocaine hydrochloride 0.4% (Chauvin Pharmaceuticals, London, United Kingdom) was applied to the operated eye. No speculum was used. A separate suction ring and applanation cone were used for each eye. The surgical technique was a modified version of the soft docking technique, whereby the clip on the suction cup was locked at the time of applanation.
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16
Jul0Accuracy and Precision of LASIK Flap Thinkness Using IntraLase: Part 1
Laser in situ keratomileusis surgery is a safe and effective method of treating myopia, astigmatism, and hyperopia. The IntraLase femtosecond laser provides an alternative method of cap creation. We report the safety profi le of the IntraLase femtosecond laser (IntraLase Corp, Irvine, Calif) in a large cohort of patients operated by a single surgeon (G.S.). The reproducibility of flap thickness is also described, which has important implications for reducing the potential risk of long-term ectasia.
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Jul0A Review of Laser in situ Keratomileusis: Part 6
Autoimmune diseases: Autoimmune diseases include systemic lupus erythematosus, rheumatoid arthritis, Wegener’s granulomatosis, polyarteritis nodosa, Churg–Strauss syndrome and relapsing polychondritis. Laser in situ keratomileusis may be appropriate if the patient is systemically well controlled and there is no evidence of ocular disease. The rate of complications in these patients does not appear to be higher, and recent studies have reported good refractive outcomes.
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Jul0A Review of Laser in situ Keratomileusis: Part 5
Thin corneas: One of the key issues in preoperative assessment is the exclusion from surgery of patients at risk of keratectasia. The occurrence of corneal ectasia may be in part due to unpredictable changes in corneal rigidity and stability following LASIK in some patients or excess tissue removal. It should be noted that a residual stromal thickness of 250–300 mm is required to minimize this risk.9,10 Intraoperative pachymetry may be useful in patients where the calculated residual bed thickness is close to the safe lower limits. Patients with thin corneas may be offered LASIK if normal corneal topography is demonstrated and the calculated residual stromal thickness is adequate. However, surface ablation may be a better option for patients with thinner corneas.
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