Visual Performance After Photorefractive Keratectomy

Verdon, Wayne

doi:10.1001/archopht.1996.01100140663003

Cited by 136 publications

(55 citation statements)

References 31 publications

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“…This phenomenon is difficult to explain but it could be speculated that some changes may not be manifested until 2 years after PRK, e.g., late-onset corneal haze, changes in tearfilm dynamics, desiccation keratitis, sub-clinical healing, or atrophic change, etc. Perhaps it was the result of older technology and different surgical techniques (9). More recently, however, a similar trend was also noted in Air Force pilots treated early in the USAF Aviation PRK Program using newer generation technologies that was not present in patients treated later (69).…”

Section: Analysis Of Nvg Visual Acuity Datamentioning

confidence: 68%

“…Refractive surgery (RS) in general has attained a great deal of success in the civilian community; however, consistent reports about quality of vision (QoV) problems after the surgery have surfaced (9)(10)(11)(12)(13)(14)(15)(16). This has driven a major paradigm shift in terms of defining success occupationally after refractive surgery (17)(18)(19)(20)(21)(22)(23)(24).…”

Section: Introductionmentioning

confidence: 99%

“…An early report from the UK (20) described a normal post-operative recovery sequence following PRK surgery to be poor vision for at least 1 week, watery vision for 1 month with significantly reduced contrast sensitivity, haze for one to three months although possibly more persistent, stabilization usually by 6 months but reduced contrast sensitivity for six to twelve months. A subsequent study (9), which employed smaller ablation zones, quantified the mean reduction in low contrast VA to be over I 1Y2 lines of letters at 1-year post-PRK. A more recent study (13) found that visual performance as tested with the Rabin Small Letter Low Contrast chart had not returned to pre-PRK normal in 81% of eyes at approximately one-year post-PRK.…”

Section: Introductionmentioning

confidence: 99%

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Prospective Evaluation of Mesopic Night Vision and Night Vision Goggle Visual Acuity After Photorefractive Keratectomy (PRK)

Miller¹,

Thompson²,

Baldwin³

et al. 2005

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The public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. SUPPLEMENTARY NOTES ABSTRACTThe US Air Force PRK Study involved 98 non-flying, active duty volunteer personnel. All study subjects underwent a comprehensive array of vision tests. Baseline and post-operative data were collected at the Ophthalmology Branch of the Clinical Sciences Division of the USAF School of Aerospace Medicine, in partnership with the Air Force Research Laboratory and Wilford Hall Medical Center. This report covers results from pre-and post-operative night vision goggle (NVG) visual acuity testing. 65 treated subjects and 15 untreated controls completed all post-op visits through 12 months, and 52 treated subjects and 14 untreated controls through 24 months. NVG acuities were collected on a high contrast letter chart (Bailey-Lovie), and custom made grating charts. There was a statistically significant loss of letter acuity at the 4-and 6-month post-op visits for treated subjects but not controls. Acuity returned to baseline levels by 12 months. Mean loss of acuity for groups was typically only a few letters; however, treated subjects were more likely to lose than gain acuity beyond that predicted from repeatability studies with controls.

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Section: Analysis Of Nvg Visual Acuity Datamentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Prospective Evaluation of Mesopic Night Vision and Night Vision Goggle Visual Acuity After Photorefractive Keratectomy (PRK)

Miller¹,

Thompson²,

Baldwin³

et al. 2005

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“…In contrast, PRK and LASIK for high myopia have been found to induce variable decreases in CS under photopic conditions, a notable difference between photorefractive surgeries and phakic Artisan IOL implantation[ 3, 18]. …”

Section: Discussionmentioning

confidence: 99%

Changes in Higher Order Aberrations and Contrast Sensitivity after Implantation of a Phakic Artisan Intraocular Lens

et al. 2007

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Purpose: To evaluate higher-order aberrations (HOAs) and contrast sensitivity (CS), and investigate their relationship, after implantation of a phakic Artisan intraocular lens (IOL) for high myopia. Methods: A prospective study including 25 eyes of 15 patients with high myopia (greater than –8.00 D) who underwent phakic Artisan IOL implantation was carried out. Uncorrected visual acuity (UCVA), best corrected visual acuity, manifest refraction, and pupil diameter were measured at baseline and at 1 and 3 months postoperatively. HOAs were measured by Wavescan® (VISX Inc., Santa Clara, Calif., USA) from the 3.0 mm pupil entrance, and CS was measured using the VCTS® 6500 (Vistech consultants, Inc., Dayton, Ohio, USA) under photopic conditions. The area under the log contrast sensitivity function (AULCSF), defined as the integration of the fitted third order polynomial of the log CS units between the fixed limits of 0.18 (1.5 CPD) and 1.25 (18 CPD) on the log spatial frequency scale, was calculated. Results: UCVA LogMAR improved from 1.58 at baseline to 0.22 at 3 months, and spherical equivalent refraction was –0.77 ± 0.34 D at 3 months. The total HOAs had increased slightly at 1 month. CS had decreased significantly at all cycles per degree (p < 0.05) at 1 month, but returned to baseline values at 3 months. Postoperative AULCSF did not correlate with total HOAs under photopic conditions, but correlated with UCVA LogMAR at 1 month (p = 0.037). Conclusions: Phakic Artisan IOL implantation for the correction of high myopia resulted in a small increase of HOAs under photopic conditions. At 1 month, CS was decreased, but returned to baseline at 3 months under photopic conditions. Postoperative AULCSF did not correlate with total HOAs at 1 month.

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“…One of the first studies to evaluate contrast sensitivity after PRK was completed by Verdon, et al (1996) at the Jules Stein Eye Institute. The ablation zone of the laser used in the study was only 5 millimeters in diameter since this study was In this study, the SLCT was used to evaluate the visual performance of patients before and after surface excimer laser refractive surgery, both PRK and PARK.…”

Section: Previous Studiesmentioning

confidence: 99%

Corneal Shape and Visual Performance After Keratorefractive Surgery

Pol¹

2002

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Visual Performance After Photorefractive Keratectomy

Cited by 136 publications

References 31 publications

Prospective Evaluation of Mesopic Night Vision and Night Vision Goggle Visual Acuity After Photorefractive Keratectomy (PRK)

Prospective Evaluation of Mesopic Night Vision and Night Vision Goggle Visual Acuity After Photorefractive Keratectomy (PRK)

Changes in Higher Order Aberrations and Contrast Sensitivity after Implantation of a Phakic Artisan Intraocular Lens

Corneal Shape and Visual Performance After Keratorefractive Surgery

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