Hasan Ali BAYHAN, Seray Aslan BAYHAN, Mehmet ADAM, Ersin MUHAFIZ, Şükran BEKDEMİR, Canan GÜRDAL

LENSTAR OPTİK BİYOMETRİNİN FARKLI KATARAKT TİPLERİNDE PERFORMANSININ DEĞERLENDİRİLMESİ

ÖZET Amaç: Lenstar göze temas gerektirmeyen ve kullanımı oldukça kolay olan nisbeten yeni bir optik biyo- metridir. Ancak cihaz ile tüm katarakt hastalarından ölçüm almak mümkün olmamaktadır. Bu çalışmanın amacı Lenstar ile ölçüm alınamayan katarakt tiplerini belirlemek ve ölçüm alınabilen hastalarda cihazın hedef refraksiyondan sapmasını değerlendirmektir. Gereç ve Yöntemler: Bu çalışmaya Bozok Üniversitesi Araştırma ve Uygulama Hastanesinde katarakt ameliyatı olan ardışık 339 hastanın 398 gözü dahil edildi. Hastaların detaylı oftalmolojik muayenelerinin ardından katarakt tipleri kaydedildi. Tüm olgularda göz içi lens gücünün hesaplanması için öncelikli ola- rak Lenstar ile biyometri yapıldı, ölçüm alınamayanlarda ultrasonik biyometri kullanıldı. Ameliyat sonrası 1. ayda hedef refraksiyondan sapma hesaplandı. Bulgular: Olguların 157si kadın, 182si erkekti ve yaş ortalaması 66,94±11,37 idi. Lenstar ile gözlerin 136 tanesinde (%34,1) ölçüm alınamadı. Ölçüm alınamayan gözlerin %54,4ünün (n=74) katarakt tipi matür, hipermür ve rubra iken, %22,7si (n=31) yoğun arka subkapsüler katarakt, %17,6sı (n=24) yoğun nükleer katarakt ve %5,1i (n=7) arka polar katarakt tipine sahipti. Ölçüm alınamayan kişilerin ameliyat öncesi görme düzeyi 108 gözde (%79,4) 0,05 ve altında iken, 85 gözde (%62,5) el hareketi-1 metreden parmak sayma seviyesindeydi. Lenstar optik biyometri ile hedef refraksiyondan sapma miktarı -0,23±0,45 D idi. Sonuç: Lenstar optik biyometri ile ölçüm alınamayanlar, özellikle matür ve yoğun arkasubkapsüler ka- taraktı olan ve görme düzeyi oldukça düşük hastalardır. Ölçüm alınabilen gözlerde ise refraktif sonuçlar mükemmele yakındır.

Evaluation of the Performance of Lenstar Optical Biometer in Different Cataract Types

ABSTRACT Objective: Lenstar is a comparatively new optical biometer which is very easy to handle and do not necessitate eye contact. However, it is not possible to perform measurements in all cataractous patients with this device. The aim of this study is to determine the cataract types those are unmeasurable with Lenstar and to assess the deviation from target refraction in patients that Lenstar could perform measurement. Material and Methods: Three hundred ninety eight eyes of 339 patients who underwent cataract surgery successively at Bozok University Research and Practice Hospital were included in this study. After the complete ophthalmological examination, cataract types of the patients were recorded. To calculate the intraocular lens power, Lenstar was used primarily in all cases, whereas ultrasonic biometer was used in unmeasurable cases with Lenstar. Deviation from target refraction was calculated one month after the surgery. Results: There were 157 women and 182 men and mean age of the patients was 66.94±11.37 years. Measurement could not be performed with Lenstar in 136 eyes (34.1%). Eyes with measurement failure had mature, hypermature and rubra cataract in 54.4% (n=74), dense nuclear cataract in 17.6% (n=24) and posterior subcapsular cataract in 5.1% (n=7). One hundred eight (79.4%) eyes with measurement failure had visual acuity of 0.05 or less, whereas 85 of them (62.5%) had visual acuity between hand motion to 1 meter finger count. The deviation from target refraction with Lenstar optical biometer was -0.23±0.45 D. Conclusion: The patients unmeasurable with Lenstar were the ones having especially mature and dense posterior subcapsular cataract and low visual acuity. Refractive outcomes in eyes measurable by Lenstar were excellent. Keywords: Intraocular Lens; Lenstar; Cataract; Ocular refraction.37

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ABSTRACT Objective: Lenstar is a comparatively new optical biometer which is very easy to handle and do not necessitate eye contact. However, it is not possible to perform measurements in all cataractous patients with this device. The aim of this study is to determine the cataract types those are unmeasurable with Lenstar and to assess the deviation from target refraction in patients that Lenstar could perform measurement. Material and Methods: Three hundred ninety eight eyes of 339 patients who underwent cataract surgery successively at Bozok University Research and Practice Hospital were included in this study. After the complete ophthalmological examination, cataract types of the patients were recorded. To calculate the intraocular lens power, Lenstar was used primarily in all cases, whereas ultrasonic biometer was used in unmeasurable cases with Lenstar. Deviation from target refraction was calculated one month after the surgery. Results: There were 157 women and 182 men and mean age of the patients was 66.94±11.37 years. Measurement could not be performed with Lenstar in 136 eyes (34.1%). Eyes with measurement failure had mature, hypermature and rubra cataract in 54.4% (n=74), dense nuclear cataract in 17.6% (n=24) and posterior subcapsular cataract in 5.1% (n=7). One hundred eight (79.4%) eyes with measurement failure had visual acuity of 0.05 or less, whereas 85 of them (62.5%) had visual acuity between hand motion to 1 meter finger count. The deviation from target refraction with Lenstar optical biometer was -0.23±0.45 D. Conclusion: The patients unmeasurable with Lenstar were the ones having especially mature and dense posterior subcapsular cataract and low visual acuity. Refractive outcomes in eyes measurable by Lenstar were excellent. Keywords: Intraocular Lens; Lenstar; Cataract; Ocular refraction. 37 ultrasound in 253 eyes. J Cataract Refract Surg. 2003;29(4):741-6. 10. Freeman G, Pesudovs K. The impact of cataract severity on measurement acquisation with the IOLMaster. Acta Ophthalmol Scand. 2005;83(4):439-42. 11. Mylonas G, Sacu S, Buehl W, Ritter M, Georgopoulos M, Schmidt-Erfurth U. Performance of three biometry devices in patients with different grades of age-related cataract. Acta Ophthalmol. 2011;89(3):237-41. 12. Landers J, Goggin M. Comparison of refractive outcomes using immersion ultrasound biometry and IOLMaster biometry. Clin Experiment Ophthalmol. 2009;37(6):566-9.