Journals / Glokom Katarakt / 2009 / Cilt: 4 - Sayı: 2

Evaluation of corneal biomechanical properties measured by ocular response analyzer in pseudophakic patients

Psödofakik hastalarda oküler response analizör ile ölçülen korneal biyomekanik özelliklerin değerlendirilmesi

Pages
84–88
DOI
—
🏛️Bibliographic metadata and full text access for this article are provided via DergiPark.
DergiPark Record ↗
✨

AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

Conclusion: Corneal biomechanical parameters measured by ORA do not change significantly in pseudophakic patients and cataract surgery seems not to affect the viscoelastic properties of the cornea at the 2nd postoperative month.

📌 3 Key Takeaways

🎯
Objective & Hypothesis:Purpose: To assess the corneal biomechanical properties by ocular response analyzer in pseudophakic patients and compare them with those in healthy subjects.
📊
Key Findings & Data:Materials and Methods: Forty eyes of 40 patients who underwent uneventful phacoemulsification cataract surgery were included in the study.
💡
Conclusion & Impact:Conclusion: Corneal biomechanical parameters measured by ORA do not change significantly in pseudophakic patients and cataract surgery seems not to affect the viscoelastic properties of the cornea at the 2nd postoperative month.
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Domain Parameters

Abstract

Purpose: To assess the corneal biomechanical properties by ocular response analyzer in pseudophakic patients and compare them with those in healthy subjects. Materials and Methods: Forty eyes of 40 patients who underwent uneventful phacoemulsification cataract surgery were included in the study. Group 1 (n=40) consisted of pseudophakic eyes, group 2 (n=40) consisted of nonoperated fellow eyes of the same patients, and group 3 (n=40) consisted of eyes of age-matched healthy subjects. Corneal-compensated intraocular pressure (IOPcc), Goldmann-correlated IOP (IOPg), corneal hysteresis (CH), and corneal resistance factor (CRF) were measured by ocular response analyzer (ORA) at the postoperative 2nd month. Intraocular pressure with Goldmann applanation tonometer (GAT IOP) and central corneal thickness (CCT) with ultrasonic pachymeter were also measured. Statistical analyses were performed using ANOVA, Student’s t-test, and Pearson’s correlation analysis. Results: All measurements were performed at postoperative 8.6±2.8 weeks in pseudophakic patients. Mean IOPcc was 17.1±3.9 mmHg, IOPg was 16.4±4.5 mmHg, CRF was 10.4±2.4 mmHg, CH was 10.07±1.9 mmHg, and CCT was 558 μm in pseudophakic patients (p=0.252, 0.663, 0.219, 0.92, 0.121, respectively). IOPcc-GAT IOP mean difference was 2.1 mmHg (p=0.006) and IOPg-GAT IOP mean difference was 1.4 mmHg (p=0.09) in pseudophakic patients. IOPg, CH, and CRF showed significant correlations with CCT (r=0.437, p=0.005; r=0.568, p=0.001; r=0.632, p=0.001, respectively) but there were no correlation between CCT and IOPg (r=0.144, p=0.375), or between CCT and GAT IOP (r=0.154, p=0.343) in pseudophakic patients. Conclusion: Corneal biomechanical parameters measured by ORA do not change significantly in pseudophakic patients and cataract surgery seems not to affect the viscoelastic properties of the cornea at the 2nd postoperative month.

Özet

Amaç: Psödofakik gözlerde Oküler Response Analizör (ORA) ile ölçülen korneanın biyomekanik parametrelerini değerlendirmek ve normal bireyler ile karşılaştırmak. Gereç ve Yöntem: Çalışmaya fakoemülsifikasyon ve göz içi lens implantasyonu geçirmiş, komplikasyonu olmayan 40 hasta dahil edildi. Psödofakisi olan gözler grup 1 (n=40), aynı hastaların operasyon geçirmemiş diğer gözleri grup 2’yi (n=40) oluşturdu. Yaşça eşleştirilmiş sağlıklı bireylerin sağ gözleri kontrol grubu olarak grup 3’ü (n=40) oluşturdu. Postoperatif 2.ayda tüm olgulara ORA ile ölçüm yapıldı. Kornea düzeltmeli göz içi basıncı (GİBcc), Goldmann ile uyumlu göziçi basıncı (GİBg), korneal rezistans faktör (KRF) ve korneal histerezis (KH) değerleri kaydedildi. Goldmann applanasyon tonometresi (GAT) ile GİB ve ultrasonik pakimetri ile santral kornea kalınlıkları (SKK) ölçüldü. Verilerin istatistiksel analizinde ANOVA, Student t-testi ve Pearson korelasyon analizi kullanıldı. Bulgular: Ölçümler katarakt operasyonu sonrası ortalama 8.6±2.8 haftada yapıldı. Psödofakik grupta ortalama GİBcc. 17,1±3.9 mmHg, GİBg 16.4±4.5 mmHg, KRF 10.4±2.4 mmHg, KH 10.07±1.9 mmHg ve SKK ise 558 μm idi ( sırasıyla, p=0.252, 0.663, 0.219, 0.92, 0.121). Psödofakik grupta, GAT GİB ile GİBcc değerleri arasında 2.1 mmHg (p=0.006), GAT GİB ile GİBg değerleri arasında ise 1.4 mmHg fark mevcuttu (p=0.09). Psödofakik grupta SKK ile GİBg, KH ve KRF değerleri arasında korelasyon saptanırken (sırasıyla, r=0.437, p=0.005; r=0.568, p=0.001; r=0.632, p=0.001), SKK ile GİBcc (r=0.144, p=0.375) ve SKK ile GAT GİB (r=0.154, p=0.343) değerleri arasında bir ilişki saptanmadı. Sonuç: Psödofakik gözlerde ameliyat sonrası 2. ayda ORA ile ölçülen korneal biyomekanik parametrelerde normal bireylere göre anlamlı değişim oluşmamakta ve katarakt cerrahisi korneanın viskoelastik özelliklerini önemli derecede etkilememektedir

🔖

Cite This Article

ÖZTÜRK, F., KÜSBECİ, T., YAVAŞ, G., ERMİŞ, S. S., İNAN, Ü. Ü. (2009). Evaluation of corneal biomechanical properties measured by ocular response analyzer in pseudophakic patients. Glokom Katarakt, Cilt: 4 - Sayı: 2, 84–88. https://ajindex.com/articles/226588

References (15)

  1. Herndon LW.: Measuring intraocular pressure-adjustments for corneal thickness and new technologies. Curr Opin Ophthalmol. 2006;17:115-119
  2. Brandt JD.: Corneal thickness in glaucoma screening, diagnosis, and management. Curr Opin Ophthalmol. 2004;15:85-89
  3. Liu J, Roberts CJ.: Influence of corneal biomechanical properties on intraocular pressure measurement. Quantitative analysis. J Cataract Refract Surg. 2005;31:146-155
  4. Arıtürk N.: Glokomda Santral kornea kalınlık ölçümü ve önemi. GloKat. 2006;1:1-6
  5. Medeiros FA, Weinreb RN. Evaluation of the influence of corneal biomechanical properties on intraocular pressure measurements using the ocular response analyzer. J Glaucoma. 2006;15:364-370
  6. Lam A, Chen D, Chıu R, et al.: Comparison of Intraocular Pressure Measurements Between Ocular Response Analyzer and Goldmann Applanation Tonemeter in Normal Chinese. Optom Vis Sci. 2007;84:909-914
  7. Luce DA. Determining in vivo biomechanical properties of the cornea with an ocular response analyzer. J Cataract Refract Surg. 2005; 31:156-162
  8. Kirwan C, O’Keefe M, Lanigan B. Corneal hysteresis and intraocular pressure measurement in children using the reichert ocular response analyzer. Am J Ophthalmol. 2006;142:990-992
  9. Beltrame G, Salvetat ML, Driussi G, Chizzolini M.: Effect of incision size and site on corneal endothelial changes in cataract surgery. J Cataract Refract Surg. 2002;28:118-125
  10. Takashashi H, Sakamoto A, Takashashi R, et al.: Free radicals in phacoemulsification and aspiration procedures. Arch Ophthalmol. 2002;120:1348-1352
  11. Brown KE, Congdon NG.: Corneal structure and biomechanics: impact on the diagnosis and management of glaucoma. Curr Opin Ophthalmol. 2006;17:338-343
  12. Kida T, Liu JH, Weinreb RN.: Effect of 24-hour corneal biomechanical changes on intraocular pressure measurement. Invest Ophthalmol Vis Sci. 2006;47:4422-4426
  13. Laiquzzaman M, Bhojwani R, Cunliffe I, et al.: Diurnal variation of ocular hysteresis in normal subjects: relevance in clinical context. Clinical and Experimental Ophthalmology. 2006;34:114-118
  14. Shah S, Laiquzzaman M, Cunliffe I, et al.: The use of the Reichert ocular response analyser to establish the relationship between ocular hysteresis, corneal resistance factor and central corneal thickness in normal eyes. Contact Lens & Anterior Eye. 2006;29:257-262
  15. Hager A, Loge K, Füllhas MO, et al.: Changes in Corneal Hysteresis After Clear Corneal Cataract Surgery. Am J Ophthalmol. 2007;144