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  • SLACK, Inc.  (6)
  • 1
    Online Resource
    Online Resource
    Contrast Sensitivity in Patients With Emmetropic Presbyopia Before and After Small-Aperture Inlay Implantation
    SLACK, Inc. ; 2016
    In:  Journal of Refractive Surgery Vol. 32, No. 6 ( 2016-06), p. 386-393
    Details
    In: Journal of Refractive Surgery, SLACK, Inc., Vol. 32, No. 6 ( 2016-06), p. 386-393
    Abstract: To develop a normative contrast sensitivity function and examine the postoperative contrast sensitivity outcomes for emmetropic patients with presbyopia implanted with a KAMRA intracorneal inlay (AcuFocus Inc., Irvine, CA) in their non-dominant eyes. METHODS: A prospective, non-randomized, multicenter clinical trial was conducted on 507 patients between 45 and 60 years of age who were monocularly implanted with the KAMRA inlay. A predetermined subgroup of 335 patients in the contrast sensitivity substudy were measured preoperatively and postoperatively with the Functional Acuity Contrast Test (FACT) chart in the Optec 6500 Vision Tester (Stereo Optical Co., Chicago, IL) under monocular and binocular, photopic and mesopic without glare, and binocular mesopic with glare conditions each over four spatial frequencies (3, 6, 12, and 18 cycles per degree for photopic conditions and 1.5, 3, 6, and 12 cycles per degree for mesopic conditions). Normative ranges were developed using 1.96 standard deviations from the preoperative mean logCS (log 10 unit of contrast sensitivity). RESULTS: The preoperative contrast sensitivity measurements were used to develop the normative contrast sensitivity curves. Postoperatively, contrast sensitivity was stable both monocularly and binocularly and average contrast sensitivity remained within the normative ranges. Postoperative contrast sensitivity was mildly reduced monocularly but not binocularly, and the ratio of area under logCS function comparing postoperative to preoperative values was above 90% for all but one condition. CONCLUSIONS: Normative contrast sensitivity curves for a presbyopic population are established to provide a referent in the investigation of the impact of other presbyopia-correcting ophthalmic procedures on contrast sensitivity. [ J Refract Surg. 2016;32(6):386–393.]
    Type of Medium: Online Resource
    ISSN: 1081-597X
    URL: Article
    DOI: 10.3928/1081597X-20160217-04
    Language: English
    Publisher: SLACK, Inc.
    Publication Date: 2016
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  • 2
    Online Resource
    Online Resource
    Factors Predictive of LASIK Flap Thickness With the Hansatome Zero Compression Microkeratome
    SLACK, Inc. ; 2005
    In:  Journal of Refractive Surgery Vol. 21, No. 3 ( 2005-05), p. 253-259
    Details
    In: Journal of Refractive Surgery, SLACK, Inc., Vol. 21, No. 3 ( 2005-05), p. 253-259
    Abstract: ABSTRACT PURPOSE: To determine the explanatory power of preoperative variables and corneal flap thickness in laser in situ keratomileusis (LASIK) using the Hansatome zero compression microkeratome (Bausch & Lomb, Rochester, NY). METHODS: A prospective, nonrandomized, comparative interventional case study was performed on 250 eyes of 129 consecutive patients who underwent LASIK surgery using the Hansatome zero compression microkeratome. A 160-µm or 180-µm microkeratome head and an 8.5- or 9. 5-mm suction ring were used in the procedures. Preoperative measurements included refraction, spherical equivalent, keratometry, intraocular pressure, corneal white-to-white, anterior chamber depth, and corneal eccentricity. Corneal thickness was measured intraoperative Iy using ultrasonic pachymetry before and after flap creation, and the difference was taken as flap thickness. Flap diameter was measured with a corneal gauge. Data were analyzed using simple, multiple, stepwise linear and non- 1 inear regression analyses and twotailed t tests. RESULTS: The mean flap thickness was 124±17 µm with the nominal 160-µm head and 142 ±20 µm with the nominal 180-µm head. One third (33%) of the total variation in flap thickness could be accounted for by three preoperative variables: average corneal thickness, spherical equivalent refraction, and choice of 160- or 180-µm microkeratome head. A simple correlation of 0.114 was noted between corneal eccentricity and flap thickness, but this variable did not add significant explanatory power on multiple regression analysis. Linear regression analysis allowed determination of a flap thickness nomogram with a standard error of the estimate of 16.9 µm and a 95% confidence interval of ±33.1. CONCLUSIONS: Corneal thickness is the most systematic predictor of corneal flap thickness using the Hansatome microkeratome. Because three preoperative variables account for only 33% of the range in flap thickness, future studies should focus on variations in blade extension and corneal biomechanical factors, which may also play an important role in determining flap thickness. [J Refract Surg. 2005;21:253-259.]
    Type of Medium: Online Resource
    ISSN: 1081-597X
    URL: Article
    DOI: 10.3928/1081-597X-20050501-08
    Language: English
    Publisher: SLACK, Inc.
    Publication Date: 2005
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  • 3
    Online Resource
    Online Resource
    Proper Positioning of the Plume Evacuator in the VISX Star3 Excimer Laser Minimizes Central Island Formation in Patients Undergoing Laser in situ Keratomileusis
    SLACK, Inc. ; 2003
    In:  Journal of Refractive Surgery Vol. 19, No. 3 ( 2003-05), p. 309-315
    Details
    In: Journal of Refractive Surgery, SLACK, Inc., Vol. 19, No. 3 ( 2003-05), p. 309-315
    Abstract: ABSTRACT PURPOSE: To identify risk factors in a series of patients who developed steep central islands after laser in situ keratomileusis (LASIK). METHODS: We analyzed and compared the refractive and topographic outcome of a study group composed of 83 eyes of 44 patients who underwent LASIK using the VISX Star3 excimer laser with a refraction-matched control group of 83 eyes treated later. The vacuum aspirator of the excimer laser was abnormally positioned during the surgeries performed in the study group. RESULTS: Mean preoperative spherical equivalent refraction in the study group was -6.75 ± 2.50 D. Four eyes with a mean preoperative spherical equivalent refraction of -9.27 ± 2.29 D developed steep central islands. Thirty-three (38%) of 83 eyes treated needed retreatment for residual myopia or myopic astigmatism. In the control group, mean preoperative spherical equivalent refraction was -6.76 ± 2.50 D. Ninety-three percent of eyes were within ±1.00 D of target refraction. Five (6.02%) of 83 eyes required retreatment and no eyes developed central islands. CONCLUSION: The abnormally positioned vacuum aspirator coupled with the higher preoperative refractive correction were the likely causative factors for central island formation and the increased incidence of undercorrection in these patients. [J Refract Surg 2003;19:309-315]
    Type of Medium: Online Resource
    ISSN: 1081-597X
    URL: Article
    DOI: 10.3928/1081-597X-20030501-07
    Language: English
    Publisher: SLACK, Inc.
    Publication Date: 2003
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  • 4
    Online Resource
    Online Resource
    Late Corneal Scarring After Photorefractive Keratectomy Concurrent With Development of Systemic Lupus Erythematosus
    SLACK, Inc. ; 2002
    In:  Journal of Refractive Surgery Vol. 18, No. 6 ( 2002-11), p. 750-752
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    In: Journal of Refractive Surgery, SLACK, Inc., Vol. 18, No. 6 ( 2002-11), p. 750-752
    Abstract: ABSTRACT PURPOSE: To report a case of late-onset corneal haze following previous photorefractive keratectomy (PRK) concurrent with the development of systemic lupus erythematosus. METHODS: Single case report and review of medical literature. RESULTS: A 41 -year-old woman underwent uneventful bilateral, non-simultaneous photorefractive keratectomy (PRK) with retreatment of the right eye after 1 year. Two months after retreatment, the patient presented with headaches and mental status changes and was diagnosed with systemic lupus erythematosus. Severe reticular corneal scarring developed in the right eye 1 year after retreatment. After the patient's disease was well controlled on a maintenance dose of hydroxychloroquine 200 mg twice a day, mechanical debridement was performed on the right cornea with a marked decrease in corneal haze and improved best spectacle-corrected vision. CONCLUSION: Patients who manifest with autoimmune disorders such as systemic lupus erythematosus may be at greater risk for developing dense, reticular corneal scars after PRK. [J Refract Surg 2002;18:750-752]
    Type of Medium: Online Resource
    ISSN: 1081-597X
    URL: Article
    DOI: 10.3928/1081-597X-20021101-16
    Language: English
    Publisher: SLACK, Inc.
    Publication Date: 2002
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  • 5
    Online Resource
    Online Resource
    Attitudes of Successful Contact Lens Wearers Toward Refractive Surgery
    SLACK, Inc. ; 1996
    In:  Journal of Refractive Surgery Vol. 12, No. 1 ( 1996-01), p. 128-133
    Details
    In: Journal of Refractive Surgery, SLACK, Inc., Vol. 12, No. 1 ( 1996-01), p. 128-133
    Abstract: ABSTRACT BACKGROUND: Traditionally, spectacle wearers and contact lens failures have been the patient population targeted for refractive surgery. We surveyed successful contact lens wearers to determine their attitudes toward refractive surgery. METHODS: One hundred thirty-three consecutive successful myopic contact lens wearers older than 21 years were requested to read information regarding both radial keratotomy and excimer photorefractive keratectomy and complete a questionnaire. We report on the relationship between interest in undergoing radial keratotomy or photorefractive keratectomy and various patient parameters. RESULTS: More than 75% of those surveyed indicated that they would consider either procedure at any time in the future. The only statistically significant correlation found was that patients younger than 40 more frequently expressed an interest in undergoing radial keratotomy than patients older than 40. Nearly 70% of those surveyed would not spend more than $500 per eye for either procedure, and most patients grossly underestimated the costs associated with contact lens wear. CONCLUSIONS: In addition to spectacle wearers and contact lens failures, successful contact lens wearers can also be considered potential candidates for refractive surgery, provided it can be offered at a cost acceptable to them and if concerns regarding surgical side effects are addressed to satisfaction. This group does not appear to represent "early adapters" to new refractive technologies. The greatest interest was expressed by those younger than 40 years. [J Refract Surg. 1996;12:128-133.]
    Type of Medium: Online Resource
    ISSN: 1081-597X
    URL: Article
    DOI: 10.3928/1081-597X-19960101-23
    Language: English
    Publisher: SLACK, Inc.
    Publication Date: 1996
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  • 6
    Online Resource
    Online Resource
    Presumed Epithelial Cyst in the Anterior Chamber Following Refractive Keratotomy
    SLACK, Inc. ; 1994
    In:  Journal of Refractive Surgery Vol. 10, No. 6 ( 1994-11), p. 652-655
    Details
    In: Journal of Refractive Surgery, SLACK, Inc., Vol. 10, No. 6 ( 1994-11), p. 652-655
    Abstract: ABSTRACT BACKGROUND: A free floating cyst in the anterior chamber was observed 10 days after a 35-yearold woman underwent an eight-incision radial keratotomy and two-incision transverse keratotomy of the left eye. METHODS: A single self-sealing microperforation had occurred on the inferotemporal incision during the initial surgery, which used a two direction incision technique. RESULTS: A free floating cystic structure was first noted by the surgeon 10 days after surgery, when the patient returned for repeated surgery for residual myopia. After 18 months, there was little change in the size or appearance of the cyst. The patient, who was informed of the complication, remained asymptomatic with uncorrected visual acuity of 20/25 + 2 bilaterally. Because of the lack of growth of the cyst, continued observation was chosen instead of surgical removal. The cause of the cyst is unknown. CONCLUSION: A free floating cyst in the anterior chamber may occur after refractive keratotomy. [Refract Corneal Surg. 1994;10:xx-xx.]
    Type of Medium: Online Resource
    ISSN: 1081-597X
    URL: Article
    DOI: 10.3928/1081-597X-19941101-11
    Language: English
    Publisher: SLACK, Inc.
    Publication Date: 1994
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