Variation in Normal Corneal Shape and the Influence of Eyelid Morphometry

Maseedupally, Vinod; Gifford, Paul; Swarbrick, Helen A.

doi:10.1097/opx.0000000000000511

Cited by 19 publications

(13 citation statements)

References 34 publications

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“…Our results differ from those of many reports investigating Western children [ 4 – 6 , 16 , 17 ]. Maseedupally et al found that several eyelid morphometry appear to influence corneal shape in primary gaze and horizontal palpebral fissure width and upperlid curvature can affect corneal spherical equivalent with difference between ethnicities [ 18 ]. This might be due to anatomical morphometrical differences in Korean children, including more puffy eyelids and a more prominent epicanthal fold than Western children.…”

Section: Discussionmentioning

confidence: 99%

Refractive error characteristics in patients with congenital blepharoptosis before and after ptosis repair surgery

et al. 2016

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Background: We examined the effect of surgical repair on the pattern of refractive errors in Korean patients with congenital blepharoptosis. Methods: We reviewed the clinical records of 54 patients with congenital blepharoptosis who attended our hospital from 2006 to 2012 and underwent a detailed refractive examination before and after ptosis repair surgery. Among them, 21 of the patients whose refractive data was available for both before and after the surgery were included in order to observe the effect of ptosis repair surgery on refractive error characteristics. The astigmatism groups were divided into three subgroups: with-the-rule (WTR), against-the-rule (ATR), and oblique astigmatism (OA). We also evaluated the severity of astigmatism. Results: Before surgery, the ptotic eyes had more severe astigmatism and a greater percentage of OA than the fellow eyes. The changes in astigmatism magnitude before and after surgery were not significant, but the proportion of subjects with OA increased significantly. In ptotic eyes, amblyopia was found in 14 eyes (20.9 %). 3 eyes (4.5 %) were from solely occlusive visual stimulus deprivation due to severe ptosis, and 11 eyes were from refractive errors. Among refractive errors, amblyogenic astigmatism made up to the largest proportion of patients (8 patients, 11.9 %). Conclusions: Ptotic eyes had more severe astigmatism and more OA than fellow eyes. Amblyogenic astigmatism was more common in ptotic eyes. A change in astigmatism toward the OA axis was significantly detected after surgery, and that can be possible amblyogenic cause. Therefore, the correction of astigmatism before and after ptosis repair surgery is very important to prevent amblyopia.

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Section: Discussionmentioning

confidence: 99%

Refractive error characteristics in patients with congenital blepharoptosis before and after ptosis repair surgery

et al. 2016

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“…Most notable was a significantly greater degree of mid‐peripheral corneal flattening in the superior‐nasal region of East Asian eyes, at the approximate location of the superior nasal eyelid margin, along with a larger increase in negative vertical coma. It has been well documented that East Asian eyes typically display narrower vertical palpebral apertures (with the upper eyelid substantially closer to the corneal centre) along with a steeper upper lid angle compared to Caucasian eyes . These ethnic anatomical differences in the upper eyelid, or the tightness/tension of the eyelid, may explain the differences observed in the corneal optics.…”

Section: Discussionmentioning

confidence: 99%

“…It has been well documented that East Asian eyes typically display narrower vertical palpebral apertures (with the upper eyelid substantially closer to the corneal centre) along with a steeper upper lid angle compared to Caucasian eyes. 24,25 These ethnic anatomical differences in the upper eyelid, or the tightness/tension of the eyelid, may explain the differences observed in the corneal optics. However, since central corneal clearance was maintained during lens wear (based on OCT imaging), eyelid forces do not appear to simply mechanically compress the posterior lens surface against the cornea, but perhaps results in tighter peripheral seal off and altered post-lens tear layer fluid dynamics.…”

Section: Discussionmentioning

confidence: 99%

“…Since ethnic variations in anterior eyelid morphometry have been well documented (e.g. significantly smaller vertical and horizontal palpebral fissures in Asians compared to Caucasians), 24,25 which may potentially influence the fit or stability of a contact lens, 26 a secondary aim was to examine the influence of ethnicity upon changes in corneal optics.…”

Section: Introductionmentioning

confidence: 99%

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Miniscleral lens wear influences corneal curvature and optics

Vincent

Alonso‐Caneiro

Collins

2015

Ophthalmic Physiologic Optic

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Miniscleral contact lenses that vault the cornea induce significant changes in anterior corneal surface topography and higher order aberrations following 8 h of lens wear. The region of greatest corneal flattening was observed in the superior-nasal mid-periphery, more so in East Asian participants. Practitioners should be aware that corneal measurements obtained following miniscleral lens removal may mask underlying corneal steepening.

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“…Of these patients, 70% had significant refractive error, 43% had astigmatism of more than 1.0 D, 55% had anisometropia of more than 1.25 D sphere or 0.75 D cylinder, 27.5% had strabismus, and 50% had amblyopia 18 . In cases of unilateral Ptosis, the drooping eye has more amblyogenic refractive error than the normal eye 19,20 .…”

Section: Resultsmentioning

confidence: 99%

Mean Change in Refractive Status After Levator Muscle Resection in Patients of Simple Congenital Ptosis

Javaid¹,

Chaudhary²,

Habib³

et al. 2020

pak J Ophthalmol

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Purpose: To determine the mean change in refractive status after Levator muscle resection in patients of simple congenital ptosis. Study Design: Quasi Experimental study. Place and Duration of Study: This study was carried out at Institute of Ophthalmology, King Edward Medical University, Mayo Hospital Lahore, from 2014 to 2015. Material & Methods: Fifty patients were selected under the age of 12 years with no sex predilection presenting with simple congenital ptosis of pupil sparing type. Patients with neurogenic, aponeurotic ptosis, mechanical ptosis, Blepharophimosis syndrome, patients with previous failed ptosis surgery and patients with corneal anomalies were excluded. After history and examination, Cycloplegic retinoscopy was done, which was repeated after surgical intervention. All interventions were done by a single ophthalmic surgeon. The patients were examined and discharged on the second post operative day. All data including preoperative and postoperative recordings of spherical and cylindrical values were collected on a self-designed proforma. Follow up period was extended to 3 months. At 3rd month cycloplegic retinoscopy was done and change in character of refractive status was analyzed. Mean change in refractive status was calculated by difference of preoperative and postoperative sphere and cylinder values. Results: Mean age of patients was 4.26 ± 3.78 years. Mean change in spherical value after treatment was 0.447 ± 0.339. This difference was statistically significant with p-value = 0.000. While mean change in cylindrical value after treatment was 0.640 ± 0.580. This difference in cylinder value after treatment was also statistically significant with p-value = 0.000. Conclusion: Levator muscle resection has a significant effect on refractive status of the patients with congenital ptosis.

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Variation in Normal Corneal Shape and the Influence of Eyelid Morphometry

Abstract: Sectorial variation is present in normal corneal shape and this variation is not significantly different between East and non-East Asian eyes. Several eyelid features appear to influence corneal shape in primary gaze.

Cited by 19 publications

References 34 publications

Refractive error characteristics in patients with congenital blepharoptosis before and after ptosis repair surgery

Refractive error characteristics in patients with congenital blepharoptosis before and after ptosis repair surgery

Miniscleral lens wear influences corneal curvature and optics

Mean Change in Refractive Status After Levator Muscle Resection in Patients of Simple Congenital Ptosis

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