Influence of Apical Clearance on Mini-Scleral Lens Settling, Clinical Performance, and Corneal Thickness Changes

Purpose: The purpose of this work was to define the timing and magnitude of scleral contact lens settling, the factors influencing settling, and to examine whether the amount of apical clearance has an impact on clinical performance or is associated with hypoxia-induced corneal changes. Methods: Eleven patients (22 eyes) with keratoconus were fitted with a mini-scleral lens (Esclera, Brazil). Three different lenses with successively greater sagittal depths were applied to achieve 3 levels of initial apical clearance: 100 to 200 mu m (low), 200 to 300 mu m (medium), and greater than 300 mu m (high). Corneal apical clearance was measured at 15 min, 1, 2, 4, 6, and 8 hr with optical coherence tomography (OCT). Central corneal thickness was measured with OCT and Pentacam, in the morning and immediately after removal of the contact lens. Results: Mean settling was 26.8 +/- 18.8 mu m (42.7%) at 1 hr, 39.5 +/- 26.5 mu m (62.9%) at 2 hr, 50.7 +/- 31.6 mu m (80.8%) at 4 hr, 57.4 +/- 34.6 mu m (91.4%) at 6 hr, and 62.8 +/- 38.4 mu m (100%) at 8 hr. Settling rate was significantly lower in low apical clearance group (P = 0.01). The smaller diameter lenses settled more (P = 0.03). There was a slight statistically significant increase of 1.3% in central corneal thickness measured with OCT (P = 0.03). Central corneal thickness measured with Pentacam at three locations increased slightly (P = 0.001). Settling showed significant intrasubject and intersubject variations. The amount of corneal swelling and comfort scores did not differ significantly according to apical clearance. Conclusions: The average amount of settling was 62.8 mu m after 8 hr, 80% of which occurred during the first 4 hr. Slight corneal swelling (1.3%) occurred after 8 hr of wear.

Dergi Adı EYE & CONTACT LENS-SCIENCE AND CLINICAL PRACTICE
Dergi Cilt Bilgisi 43
Dergi Sayısı 4
Sayfalar 230 - 235
Yayın Yılı 2017
Eser Adı
[dc.title]
Influence of Apical Clearance on Mini-Scleral Lens Settling, Clinical Performance, and Corneal Thickness Changes
Yazar
[dc.contributor.author]
Esen, Fehim
Yazar
[dc.contributor.author]
Toker, Ebru
Yayın Yılı
[dc.date.issued]
2017
Yayıncı
[dc.publisher]
LIPPINCOTT WILLIAMS & WILKINS
Yayın Türü
[dc.type]
article
Özet
[dc.description.abstract]
Purpose: The purpose of this work was to define the timing and magnitude of scleral contact lens settling, the factors influencing settling, and to examine whether the amount of apical clearance has an impact on clinical performance or is associated with hypoxia-induced corneal changes. Methods: Eleven patients (22 eyes) with keratoconus were fitted with a mini-scleral lens (Esclera, Brazil). Three different lenses with successively greater sagittal depths were applied to achieve 3 levels of initial apical clearance: 100 to 200 mu m (low), 200 to 300 mu m (medium), and greater than 300 mu m (high). Corneal apical clearance was measured at 15 min, 1, 2, 4, 6, and 8 hr with optical coherence tomography (OCT). Central corneal thickness was measured with OCT and Pentacam, in the morning and immediately after removal of the contact lens. Results: Mean settling was 26.8 +/- 18.8 mu m (42.7%) at 1 hr, 39.5 +/- 26.5 mu m (62.9%) at 2 hr, 50.7 +/- 31.6 mu m (80.8%) at 4 hr, 57.4 +/- 34.6 mu m (91.4%) at 6 hr, and 62.8 +/- 38.4 mu m (100%) at 8 hr. Settling rate was significantly lower in low apical clearance group (P = 0.01). The smaller diameter lenses settled more (P = 0.03). There was a slight statistically significant increase of 1.3% in central corneal thickness measured with OCT (P = 0.03). Central corneal thickness measured with Pentacam at three locations increased slightly (P = 0.001). Settling showed significant intrasubject and intersubject variations. The amount of corneal swelling and comfort scores did not differ significantly according to apical clearance. Conclusions: The average amount of settling was 62.8 mu m after 8 hr, 80% of which occurred during the first 4 hr. Slight corneal swelling (1.3%) occurred after 8 hr of wear.
Açıklama
[dc.description]
WOS: 000404148100007
Açıklama
[dc.description]
PubMed: 27171130
Kayıt Giriş Tarihi
[dc.date.accessioned]
2019-12-23
Açık Erişim Tarihi
[dc.date.available]
2019-12-23
Yayın Dili
[dc.language.iso]
eng
Konu Başlıkları
[dc.subject]
Scleral lenses
Konu Başlıkları
[dc.subject]
Settling
Konu Başlıkları
[dc.subject]
Apical clearance
Konu Başlıkları
[dc.subject]
Corneal edema
Konu Başlıkları
[dc.subject]
Hypoxia
Haklar
[dc.rights]
info:eu-repo/semantics/closedAccess
ISSN
[dc.identifier.issn]
1542-2321
ISSN
[dc.identifier.issn]
1542-233X
İlk Sayfa Sayısı
[dc.identifier.startpage]
230
Son Sayfa Sayısı
[dc.identifier.endpage]
235
Dergi Adı
[dc.relation.journal]
EYE & CONTACT LENS-SCIENCE AND CLINICAL PRACTICE
Dergi Sayısı
[dc.identifier.issue]
4
Dergi Cilt Bilgisi
[dc.identifier.volume]
43
Tek Biçim Adres
[dc.identifier.uri]
https://dx.doi.org/10.1097/ICL.0000000000000266
Tek Biçim Adres
[dc.identifier.uri]
https://hdl.handle.net/20.500.12628/2776
Görüntülenme Sayısı ( Şehir )
Görüntülenme Sayısı ( Ülke )
Görüntülenme Sayısı ( Zaman Dağılımı )
Görüntülenme
33
09.12.2022 tarihinden bu yana
İndirme
1
09.12.2022 tarihinden bu yana
Son Erişim Tarihi
25 Şubat 2024 23:46
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Tıklayınız
corneal clearance apical measured settling thickness amount significant Settling greater occurred Pentacam contact significantly swelling Central lenses Purpose (100%) average scores differ according Conclusions variations during Slight comfort intersubject increase smaller diameter settled slight statistically
6698 sayılı Kişisel Verilerin Korunması Kanunu kapsamında yükümlülüklerimiz ve çerez politikamız hakkında bilgi sahibi olmak için alttaki bağlantıyı kullanabilirsiniz.

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