Contrast Sensitivity Under Photopic Conditions in Photorefractive Keratectomy: A Preliminary Study

Esente, Stefano; Passarelli, Nicola; Falco, Luisa De; Passani, F.; Guidi, D

doi:10.3928/1081-597x-19930302-19

J Refract Surg

1993

DOI: 10.3928/1081-597x-19930302-19

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Contrast Sensitivity Under Photopic Conditions in Photorefractive Keratectomy: A Preliminary Study

Stefano Esente¹,

Nicola Passarelli²,

Luisa De Falco³

et al.

Abstract: In order to control and quantify the quality of vision after photorefractive keratectomy (PRK)1-4 we tested 21 treated eyes with contrast sensitivity.5-9 (Refract Corneal Surg (suppl) 1993;9:S70S72.)

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Cited by 2 publications

References 7 publications

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Forward Light Scatter at One Month After Photorefractive Keratectomy

Tennant¹,

Gwin²,

Applegate³

et al. 1995

J Refract Surg

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BACKGROUND: Although it is known that backward light scatter increases transiently following most excimer laser photorefractive keratectomies (PRKs), it is not clear that there is a significant increase in forward light scatter, which is of primary concern for the patient. The object of this study was to determine if there is a significant change of forward light scatter at 1 month after (PRK) with an ablation zone diameter of 6 mm. METHODS: Overlapping subsets of 24 normal myopic eyes were tested before (on the day of surgery) and 1 month after PRK, using three instruments: a Stray Light Meter (16 eyes); a Computerized Stray Light Meter (14 eyes); and a mesopic Increment Threshold-Glare Paradigm (six eyes). Differences between the two eyes before PRK were compared with the differences between the same eye before and after PRK, using repeated measured analysis of variance. In addition, increment threshold data obtained from 22 eyes after PRK were compared with those of 60 controls of the same age range and distribution by a t test. RESULTS: None of the statistical comparisons approached significance at the a =0.05 level. Changes in light scatter as small as a factor of 1.95 (Stray Light Meter) and 1.55 (Increment ThresholdGlare Paradigm) could be detected as significant with a high power (0.8). Changes larger than a factor of 21 could be detected with a power of 0.8 for the Computerized Stray Light Meter. CONCLUSIONS: In these data, there is no support for the hypothesis that forward light scatter increases significantly 1 month after PRK with an ablation zone of 6 mm. Any increases in forward light scatter are unlikely to he greater than a factor of 1.5 to 2 under daytime or nighttime illumination conditions. [J Refract Surg. 1995;11:83-88.]

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Forward Light Scatter at One Month After Photorefractive Keratectomy

Tennant¹,

Gwin²,

Applegate³

et al. 1995

J Refract Surg

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Contrast Sensitivity After Posterior Chamber Phakic Intraocular Lens Implantation for High Myopia

Jiménez-Alfaro

Gómez-Tellería²,

Bueno³

et al. 2001

J Refract Surg

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PURPOSE: To evaluate contrast sensitivity after posterior chamber phakic intraocular lens (PIOL) implantation for the correction of high myopia. METHODS: Twenty eyes of ten patients had a posterior chamber phakic intraocular lens (Staar ICL) implanted to correct high myopia. Mean preoperative myopia was -14.10 ? 2.70 D. Follow-up was 24 months for all patients. Contrast sensitivity was tested with best spectacle-corrected visual acuity preoperatively and 3, 6, 12, 18, and 24 months postoperatively. RESULTS: Contrast sensitivity increased after surgery in all spatial frequencies. Normal values were achieved for low and intermediate spatial frequencies (3 and 6 c/deg). However, in spite of the improvement, values were still below normal for high spatial frequencies (12 and 18 c/deg). When the first postoperative examination was not considered, there were no statistically significant differences in contrast sensitivity values at different postoperative periods. CONCLUSION: Contrast sensitivity increased after posterior chamber phakic intraocular lens implantation (Staar ICL) in all spatial frequencies when compared to preoperative contrast sensitivity (best spectacle-corrected). [J Refract Surg 2001;17:641-645]

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Contrast Sensitivity Under Photopic Conditions in Photorefractive Keratectomy: A Preliminary Study

Abstract: In order to control and quantify the quality of vision after photorefractive keratectomy (PRK)1-4 we tested 21 treated eyes with contrast sensitivity.5-9 (Refract Corneal Surg (suppl) 1993;9:S70S72.)

Cited by 2 publications

References 7 publications

Forward Light Scatter at One Month After Photorefractive Keratectomy

Forward Light Scatter at One Month After Photorefractive Keratectomy

Contrast Sensitivity After Posterior Chamber Phakic Intraocular Lens Implantation for High Myopia

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