The Effect of Radial Keratotomy on Contrast Sensitivity

Krasnov, M M; Sé, Avetisov; Makashova, N.V.; Мамиконян, В. Р.

doi:10.1016/0002-9394(88)90059-1

Cited by 27 publications

(10 citation statements)

References 1 publication

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“…chart, mild refractive disorders and early cataracts generally cause contrast sensitivity losses at higher spatial frequencies, whereas severe refractive disorders and advanced cataracts cause contrast sensitivity losses at lower spatial frequencies [13, 14]. Although it was not previously reported that interocular difference occurred on higher spatial frequencies like 18 cpd, we found that dominant eye had better contrast sensitivity function values at mesopic 18 cpd spatial frequency.…”

Section: Discussioncontrasting

confidence: 49%

Effects of Ocular Dominance on Contrast Sensitivity in Middle-Aged People

et al. 2014

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Purpose. Our aim was to compare contrast sensitivity values of the dominant and nondominant eyes of healthy middle-aged subjects. Material and Methods. Ninety eyes of 45 healthy middle-aged subjects (30 males and 15 females) were included in this study. Patients were aged between 40 and 60 years, having uncorrected visual acuity (UCVA) of 20/25 or better (Snellen chart). Ocular dominance was determined by hole-in-the-card test. Functional acuity contrast testing (F.A.C.T.) was measured using the Optec 6500 vision testing system (Stereo Optical Co. Inc., Chicago, IL, USA) under both photopic and mesopic conditions. Results. At all spatial frequencies (1.5, 3, 6, 12, and 18 cpd), under mesopic conditions, the contrast sensitivity values of the dominant eyes were slightly greater than those of the nondominant eyes; but only 18 cpd spatial frequency measurements' difference was statistically significant (P = 0.035). Under photopic conditions, the contrast sensitivity values of the dominant eyes and non-dominant eyes were similar at all spatial frequencies (P > 0.05). Conclusions. The photopic and mesopic contrast sensitivity values of dominant and nondominant eyes of healthy middle-aged people were similar at all spatial frequencies, except at mesopic 18 cpd spatial frequency.

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Section: Discussioncontrasting

confidence: 49%

Effects of Ocular Dominance on Contrast Sensitivity in Middle-Aged People

et al. 2014

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“…The best corrected visual acuity was not affected by surgery. This is in accordance with the observations of others (Kremer & Marks 1983;Neuman et al 1983;Vaughan & Paschall 1985), though, in single cases a permanent or transient reduction of visual acuity has been reported by Waring et al (1990) and Krasnov et al (1988).…”

Section: Discussionsupporting

confidence: 93%

“…In the present study we found no difference between the CSF of the myopics before and one month after surgery in any of the test conditions. Employing daytime testing conditions, similar results have been published by Trick & Harstein (1987), while others have demonstrated a reduction in the contrast sensitivity in the early postoperative period (Krasnov et al 1988;McDonald et al 1987;Ginsburg et al 1984), some of which, however, was transient. Possible loss in contrast sensitivity has been ascribed to surgically induced change in spherical abberation (Hemenger et al 1989).…”

Section: Discussionsupporting

confidence: 73%

Contrast sensitivity in radial keratotomy

Olsen

Andersen

1991

Acta Ophthalmologica

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In a prospective study, contrast sensitivity function was determined before and one month postsurgery in 15 consecutive cases of radial keratotomy. The results obtained pre-operatively were compared to those of an age-matched, emmetropic reference group also comprising 15 persons. Three different test conditions were employed. High luminance background levels of 130 cd/m2, low luminance levels of 3.5 cd/m2 and low luminance levels completed with a central glare source of 7.5 lux. Using an eight-incisional radial keratotomy technique with a 3 mm optical zone, a median reduction in myopia of 3.5 diopters was observed. Corrected visual acuity was not affected by the surgery. The contrast sensitivity functions of the myopic group pre-operatively compared to the post-operative values showed no significant difference for any of the three test conditions. Compared to the reference group, the myopic group pre-operatively demonstrated a statistically significant reduced contrast sensitivity for all test conditions.

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“…More severe vision problems such as glaucoma, diabetic retinopathy, macular degeneration, optic neuropathies, and amblyopia may cause degradation of the entire contrast sensitivity curve. [28][29][30][31][32][33][34] In our study, contrast sensitivity curves both under photopic and mesopic conditions did not show any pathological patterns. Although it was statistically insignificant, at the highest spatial frequency (18 cpd) the difference in contrast sensitivity scores was higher than that of other frequencies.…”

Section: Discussionmentioning

confidence: 67%

The effects of posterior continuous curvilinear capsulorhexis on contrast sensitivity

Bozkurt

Yazıcı

Pekel

et al. 2009

Eye

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Purpose We aimed at evaluating the effects of posterior continuous curvilinear capsulorhexis (PCCC) on contrast sensitivity. Materials and methods In this prospective, randomized, bilateral clinical study, 40 eyes of 20 patients who underwent bilateral cataract surgery were included. The phacoemulsification machine, viscoelastic substances, surgical tools, and intraocular lenses (IOLs) were the same for both eyes. The only difference was that we conducted the PCCC procedure before IOL implantation to one of the eyes of the patients. The selection of the eye that underwent the PCCC procedure was decided randomly. Results The mean photopic contrast sensitivity values at spatial frequencies of 1.5, 3, 6, 12, and 18 cpd (cycles per degree) were 41.55, 59.90, 61.25, 32.35, and 9.75, respectively, and for the control group these values were 39. 05, 56.60, 57.95, 29.80, and 8.75, respectively. The mean mesopic contrast sensitivity values at special frequencies of 1.5, 3, 6, 12, and 18 cpd were 41.20, 54.75, 55.55, 31.70, and 9.00, respectively, and for the control group these values were 38.35, 51.70, 52.15, 30.05, and 8.00, respectively. The mean contrast sensitivity values of the eyes that underwent the PCCC procedure were slightly better than the fellow eyes at all spatial frequencies, but the difference was statistically insignificant (P40.05). Conclusions In early post-operative period, the PCCC procedure exerts some positive effects on contrast sensitivity although these effects are statistically insignificant.

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The Effect of Radial Keratotomy on Contrast Sensitivity

Cited by 27 publications

References 1 publication

Effects of Ocular Dominance on Contrast Sensitivity in Middle-Aged People

Effects of Ocular Dominance on Contrast Sensitivity in Middle-Aged People

Contrast sensitivity in radial keratotomy

The effects of posterior continuous curvilinear capsulorhexis on contrast sensitivity

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