Journal of refractive and corneal surgery最新文献_第3页

Comparison of astigmatic axis in the seated and supine positions. 坐位与仰卧位的像散轴比较。

Journal of refractive and corneal surgery Pub Date : 1994-11-01 DOI: 10.3928/1081-597X-19941101-05

E. M. Smith, J. Talamo, K. Assil, D. Petashnick

{"title":"Comparison of astigmatic axis in the seated and supine positions.","authors":"E. M. Smith, J. Talamo, K. Assil, D. Petashnick","doi":"10.3928/1081-597X-19941101-05","DOIUrl":"https://doi.org/10.3928/1081-597X-19941101-05","url":null,"abstract":"BACKGROUND\u0000Refractive error is assessed in the seated position while keratorefractive procedures are performed in the supine position. Since position-induced ocular torsion could yield suboptimal results from improper axis alignment, this study was undertaken to ascertain whether ocular cyclotorsion occurs when a subject moves from a seated to supine position.\u0000\u0000\u0000METHODS\u0000Fifty eyes of 29 subjects with refractive cylinder greater than 0.50 diopters were enrolled. Refraction was done with a phoropter and the correction was placed in a trial frame using plus cylinder. Astigmatic axis was determined in the seated and supine positions for 32 eyes by utilizing the \"rocking the cylinder\" technique and for 32 eyes using the Jackson cross cylinder. Both techniques were used for 14 eyes.\u0000\u0000\u0000RESULTS\u0000No statistically-significant difference for cylinder axis measured in the seated versus supine position was observed using the rocking the cylinder (4.3 degrees standard deviation [SD], 3.5 degrees, range 0 degrees to 13 degrees, p = NS) or the Jackson cross cylinder methods (2.3 degrees, SD, 1.9 degrees, range 0 degrees to 7 degrees, p = NS). Approximately 25% of eyes had a change in axis of 7 degrees to 16 degrees.\u0000\u0000\u0000CONCLUSIONS\u0000These data suggest that the cylinder axis does not change significantly or predictably when most subjects move from the seated to supine position. The Jackson cross cylinder method seems more accurate and reproducible than the rocking the cylinder technique in determination of astigmatic axis under these circumstances.","PeriodicalId":79348,"journal":{"name":"Journal of refractive and corneal surgery","volume":"10 6 1","pages":"615-20"},"PeriodicalIF":0.0,"publicationDate":"1994-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70146349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 47

Effect of peripheral deepening of radial keratotomy incisions. 桡骨角膜切开术切口外周加深的效果。

Journal of refractive and corneal surgery Pub Date : 1994-11-01 DOI: 10.3928/1081-597X-19941101-06

L. Poirier, P. Coulon, W. Williamson, D. Barac'h, B. Mortemousque, P. Vérin

{"title":"Effect of peripheral deepening of radial keratotomy incisions.","authors":"L. Poirier, P. Coulon, W. Williamson, D. Barac'h, B. Mortemousque, P. Vérin","doi":"10.3928/1081-597X-19941101-06","DOIUrl":"https://doi.org/10.3928/1081-597X-19941101-06","url":null,"abstract":"BACKGROUND\u0000Single and double deepening of the peripheral part of radial keratotomy incisions are used to increase the refractive effect.\u0000\u0000\u0000METHODS\u0000Single peripheral deepening was performed in 52 eyes of 36 patients and double peripheral deepening in 19 eyes of 14 patients who received radial keratotomy.\u0000\u0000\u0000RESULTS\u0000In the single peripheral deepening group, the mean change in refractive power was 4.01 diopters (D); 53.8% of eyes were within +/- 1.00 D of emmetropia; residual myopia was greater than -1.00 D in 46.2% of eyes; 65.4% of eyes achieved an uncorrected visual acuity greater than or equal to 20/40. In the double peripheral deepening group, the mean change in refractive power was 5.07 D; 52.6% of eyes wee within +/- 1.00 D of emmetropia; residual myopia was greater than -1.00 D in 47.4% of eyes; 89.4% of eyes achieved an uncorrected visual acuity greater than 20/40. The difference in mean dioptric change between the standard radial keratotomy groups and the single and double peripheral deepening groups was 0.53 D and 0.47 D, respectively.\u0000\u0000\u0000CONCLUSIONS\u0000Considering the limited additional dioptric change compared with the standard radial keratotomy surgical technique and the increased rate of complications, we think that peripheral deepening in radial keratotomy should be avoided.","PeriodicalId":79348,"journal":{"name":"Journal of refractive and corneal surgery","volume":"10 6 1","pages":"621-4"},"PeriodicalIF":0.0,"publicationDate":"1994-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70146408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mastel Byron Radial Keratotomy Guide. Mastel Byron放射角膜切开术指南。

Journal of refractive and corneal surgery Pub Date : 1994-11-01

P Binder

引用次数: 0

Deep lamellar keratotomy after overcorrected excimer laser myopic keratomileusis. 准分子激光近视角膜磨镶术后深度板层角膜切开术。

Journal of refractive and corneal surgery Pub Date : 1994-11-01 DOI: 10.3928/1081-597X-19941101-15

S. Helmy

引用次数: 1

Suturing a posterior chamber intraocular lens to the iris through limbal incisions: results in 30 eyes. 通过角膜缘切口将后房型人工晶状体与虹膜缝合:30只眼。

Journal of refractive and corneal surgery Pub Date : 1994-09-01 DOI: 10.3928/1081-597X-19940901-16

E. A. Navia-Aray

{"title":"Suturing a posterior chamber intraocular lens to the iris through limbal incisions: results in 30 eyes.","authors":"E. A. Navia-Aray","doi":"10.3928/1081-597X-19940901-16","DOIUrl":"https://doi.org/10.3928/1081-597X-19940901-16","url":null,"abstract":"BACKGROUND\u0000I have previously reported a new technique of suture fixation of a posterior chamber intraocular lens (IOL) to the iris through a limbal incision in the absence of a posterior lens capsule. This study evaluated the results of that technique as an alternative to anterior chamber lens implantation or suturing of a posterior chamber lens through the ciliary sulcus and sclera.\u0000\u0000\u0000METHODS\u0000The clinical records of 30 consecutive eyes that underwent this procedure between September 1987 and February 1991 were studied retrospectively. Four sutures were attached to four holes in the optic of a posterior chamber IOL. Two sutures on straight needles were passed through a superior limbal wound, to the pupil, reaching the inferior iris to be tied onto this iris. The two upper sutures on curved needles were passed through the pupil and going to the superior iris and then tied.\u0000\u0000\u0000RESULTS\u0000An anterior vitrectomy was done in the pupil in 18 (60%) eyes. The mean postoperative follow-up time was 40 months (range, 24 to 66 months). Nineteen eyes (63%) had visual acuities of 20/40 or better; and 10 eyes (33%) had visual acuities between 20/50 and 20/80. The remaining eye had persistent cystoid macular edema, proven by fluorescein angiography, with 20/100 visual acuity. No serious anterior segment complications occurred. There was mild pigment dispersion on the IOL in four eyes. Four eyes needed timolol drops to lower the intraocular pressure.\u0000\u0000\u0000CONCLUSIONS\u0000This technique offers a viable alternative to transscleral fixation of a posterior chamber IOL via a limbal approach.","PeriodicalId":79348,"journal":{"name":"Journal of refractive and corneal surgery","volume":"10 5 1","pages":"565-70"},"PeriodicalIF":0.0,"publicationDate":"1994-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70145803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 33

Role of topical corticosteroids and nonsteroidal antiinflammatory drugs in the etiology of stromal infiltrates after excimer photorefractive keratectomy. 外用皮质类固醇和非甾体类抗炎药在准分子光屈光性角膜切除术后间质浸润的病因学中的作用。

Journal of refractive and corneal surgery Pub Date : 1994-09-01 DOI: 10.3928/1081-597X-19940901-20

N. Sher, R. Krueger, P. Teal, R. Jans, D. Edmison

引用次数: 44

Astigmatism following photorefractive keratectomy for myopia. 屈光性角膜切除术治疗近视后的散光。

Journal of refractive and corneal surgery Pub Date : 1994-09-01

M Goggin, K Algawi, M O'Keefe

{"title":"Astigmatism following photorefractive keratectomy for myopia.","authors":"M Goggin, K Algawi, M O'Keefe","doi":"","DOIUrl":"","url":null,"abstract":"Background: Astigmatism following photorefractive keratectomy for myopia has been reported as stable as early as 2 to 3 months. The authors report 36 out of 60 consecutive eyes with variations in the cylindrical component of their refraction at 6 months after laser treatment.Method: A standard photorefractive keratectomy was carried out on 60 consecutive eyes in 52 patients over a 7-month period. The manifest refraction of these eyes was followed for 6 months.Results: Thirty-six eyes demonstrated a change in the cylindrical element of their refraction manifested as a change in cylinder power or axis, or both. The mean pretreatment cylinder power in the group that underwent a change in the cylindrical element was significantly higher than the mean of the group where this did not take place. The mean cylinder power change was 0.75 diopters (D) and in 9 eyes this change was 1.00 D or more. The corrected and uncorrected postoperative visual acuities were the same in the two groups.Conclusions: This observation implies meridional variability in the healing process of the anterior cornea following photorefractive keratectomy.","PeriodicalId":79348,"journal":{"name":"Journal of refractive and corneal surgery","volume":"10 5","pages":"540-4"},"PeriodicalIF":0.0,"publicationDate":"1994-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18536151","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Theoretical and clinical effect of preoperative corneal curvature on excimer laser photorefractive keratectomy for myopia. 术前角膜曲率对准分子激光屈光性近视角膜切除术的理论和临床影响。

Journal of refractive and corneal surgery Pub Date : 1994-09-01

J W Blaker, P S Hersh

{"title":"Theoretical and clinical effect of preoperative corneal curvature on excimer laser photorefractive keratectomy for myopia.","authors":"J W Blaker, P S Hersh","doi":"","DOIUrl":"","url":null,"abstract":"Background: Individual clinical and optical variables may influence the effect of excimer laser photorefractive keratectomy. A theoretical model to describe the influence of initial corneal power, astigmatism, and topography on the expected results of photorefractive keratectomy would be useful in identifying those variables that may ultimately improve the predictability of the procedure.Methods: Using a mathematical analysis based on the change in sagittal depth of the central ablation zone following photoablation, we predict the effect of initial corneal curvature on the ultimate outcome of a standardized photorefractive keratectomy. Refractive results from the Phase III US Food & Drug Administration clinical trials of photorefractive keratectomy were analyzed to confirm these mathematical predictions.Results: We find that the initial corneal power, theoretically, is not expected to significantly affect the refractive change that results from a given ablation. Similarly, the corneal astigmatism present before photorefractive keratectomy is expected to be only minimally altered by a spherical excimer laser treatment. Clinically, there is no detectable difference in predictability of the procedure amongst groups stratified by initial mean keratometric power.Conclusions: Our analysis provides a methodology to predict the optical effects of photorefractive keratectomy upon the cornea and may be applied to a variety of hypothetical clinical settings. The predicted lack of clinical association between initial corneal curvature and predictability of photorefractive keratectomy is confirmed.","PeriodicalId":79348,"journal":{"name":"Journal of refractive and corneal surgery","volume":"10 5","pages":"571-4"},"PeriodicalIF":0.0,"publicationDate":"1994-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18538309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Changes in refraction induced by change in intraocular lens position. 人工晶状体位置改变引起的屈光变化。

Journal of refractive and corneal surgery Pub Date : 1994-09-01

J Korynta, J Bok, J Cendelin

{"title":"Changes in refraction induced by change in intraocular lens position.","authors":"J Korynta, J Bok, J Cendelin","doi":"","DOIUrl":"","url":null,"abstract":"Background: Intraocular lens (IOL) decentration and tilt may affect postoperative refractive errors through spherical aberration of the IOL.Methods: Through a use of a ray-tracing program and by minimizing algorithm, we calculated theoretical refractive errors for various degrees of IOL decentration and tilt. We compared our results with those obtained by paraxial vergence calculations.Results: IOL decentration and/or tilt shifted postoperative refractive errors toward myopia and astigmatism of oblique origin. For example, a 3-millimeter decentration of an IOL resulted in induction of approximately -2.00 diopters (D) sphere and +0.70 D cylinder. IOL tilt affected refractive errors to a lesser degree. The change in refractive error caused by a combination of IOL decentration and tilt depended on the relationship between the geometrical axes of decentration and tilt. In the case of the least favorable combination of 12 degrees of tilt and 3 mm of decentration, it can reach -7.00 D sphere and +4.00 D cylinder.Conclusions: IOL decentration and/or tilt increase myopia and astigmatism. They are negligible for small decentrations, but could be sources of substantial postoperative refractive errors if the decentration or tile is large.","PeriodicalId":79348,"journal":{"name":"Journal of refractive and corneal surgery","volume":"10 5","pages":"556-64"},"PeriodicalIF":0.0,"publicationDate":"1994-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18536155","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Potential pitfall of the duo-trak style diamond knife. 双轨迹式钻石刀的潜在陷阱。

Journal of refractive and corneal surgery Pub Date : 1994-09-01

J D Nightingale

引用次数: 0