The Effect of Pterygia on Contrast Sensitivity and Glare Disability

Lin, Stephen; Reiter, Klaus; Dreher, Andreas W.; Frucht‐Pery, Joseph; Feldman, Sandy T.

doi:10.1016/0002-9394(89)90665-x

Cited by 13 publications

(7 citation statements)

References 6 publications

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“…Our findings are in accordance with the findings of another workers Lin et al in1989 [22]. Pterygium can cause an asymmetric distortion ofthe cornea, because the lesion typically extends radially from the corneal periphery.…”

Section: Original Research Articlesupporting

confidence: 94%

“…Studies indicate that contrast sensitivity testing may provide additional objective methods for documenting impaired vision in patients with pterygium when Snellen visual acuity is minimally affected [28]. Corneal astigmatism and contrast sensitivity values inpatients with pterygia are useful indicators for the needof pterygium surgery or as indicators of surgical success [29].…”

Section: Original Research Articlementioning

confidence: 99%

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Effect of pterygiumseverity on visual acuity and contrast sensitivity

Vohra¹,

Agarwal²,

Vohra³

et al. 2019

Trop J Ophthalmol Otolaryngol

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Aim: To evaluate prospectively the effect of pterygium excision on visual acuity and contrast sensitivity before and after surgery. Material & method: A prospective observational study where in 63 eyes of 63 patients with primary pterygia were studied before and after surgery. Examination was done in which contrast sensitivity was measured with pellirobson chart pre-operatively and one month postoperatively following pterygium excision with Conjunctival Limbal Auto Graft. Result: As the grade of pterygium increases, decrement in contrast sensitivity occurs. The visual acuity significantly increased after the surgery. Mean contrast sensitivity following pterygium surgery improved from 1.49±0.21 to 1.70±0.20 (p value <0.001). Conclusion: Visual acuity and contrast sensitivity improved significantly following pterygium excision surgery.

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Section: Original Research Articlesupporting

confidence: 94%

Section: Original Research Articlementioning

confidence: 99%

Effect of pterygiumseverity on visual acuity and contrast sensitivity

Vohra¹,

Agarwal²,

Vohra³

et al. 2019

Trop J Ophthalmol Otolaryngol

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“…Most of those topographic changes in the cornea have been reported to be reversed by successful pterygium surgery, although eyes with advanced pterygia might not normalize completely 2–6. It has been previously reported that contrast sensitivity was lower at all spatial frequencies in the patients with pterygium 7. However, it remains unclear as to whether pterygium surgery can improve contrast sensitivity which has been decreased by the development of pterygium.…”

Section: Discussionmentioning

confidence: 99%

The effect of pterygium surgery on contrast sensitivity and corneal topographic changes

Oh¹,

Wee²

2010

OPTH

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PurposeTo investigate the effect of pterygium surgery on corneal topography and contrast sensitivity.Patient and methodsThe IRB approved this prospective, nonrandomized, self-controlled study. Computerized videokeratography (Orbscan II) was performed in 36 patients with primary pterygia, both before and 1 month after pterygium excision with limbal-conjunctival autografting. The topographic parameters were compared. Spatial contrast sensitivity testing was performed using VCTS 6500. Differences between preoperative and postoperative values were evaluated statistically.ResultsThe mean Sim K astigmatism and irregularity index, significantly decreased after pterygium surgery. The mean refractive power significantly increased after the operation. The “with-the-rule” astigmatism induced by pterygium became “against-the-rule” astigmatism after pterygium removal (P = 0.041). The contrast sensitivity of 6, 12, and 18 cycles per degree, significantly increased from 1.55 ± 0.28, 0.97 ± 0.47, and 0.29 ± 0.16 to 1.72 ± 0.18, 1.21 ± 0.44, and 0.65 ± 0.48, respectively (P = 0.007, <0.001, <0.001, respectively).ConclusionsPterygium surgery significantly reduces corneal topographic astigmatism and improves contrast sensitivity.

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“…Pterygium is a common eye condition notorious for conjunctiva redness (which may be of cosmetic implication), lacrimation, itching / grittiness that may cause insomnia/psychological upset and visual impairment resulting from induced astigmatism, glare, and decreased contrast sensitivity (Lin et al, 1989). It is a triangular or wing-shaped conjunctiva encroachment on the cornea, may be atrophic, stationary or progressive (Johnson, 2003;Luanratanakorn et al, 2006) and could induce diplopia.…”

Section: Introductionmentioning

confidence: 99%

Blindness Caused by Pterygium – A Case Report

Ayanniyi¹,

Badmos²,

Olatunji³

et al. 2011

Sierra Leone j. biomed. res.

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Pterygium leading to bilateral blindness and forcing patient to quit job is uncommon. This is a case report of a 46 year old indigent woman who had blinding pterygia over 10 years. She could not afford pterygium excision offered in a private eye clinic where she initially presented after a period of unsuccessful self medication. She was forced out of sewing job consequent to her inability to thread needle, difficulty reading number on the tape rule and difficulty recognising faces of her clients. Six years later, she presented at eye clinic of the University of Ilorin Teaching Hospital, Nigeria with advanced bilateral pterygia. Having defaulted from clinic over 4 months for lack of fund, the patient, after concession, had successful bilateral pterygia excision using bare sclera technique with Mitomycin C (MMC) dab. There was restoration of the lost vision. Pterygium is a cause of avoidable blindness with consequential impact on quality of life. Eye care providers should identify individual patient challenges to reduce avoidable blindness.

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The Effect of Pterygia on Contrast Sensitivity and Glare Disability

Cited by 13 publications

References 6 publications

Effect of pterygiumseverity on visual acuity and contrast sensitivity

Effect of pterygiumseverity on visual acuity and contrast sensitivity

The effect of pterygium surgery on contrast sensitivity and corneal topographic changes

Blindness Caused by Pterygium – A Case Report

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