Influence of Artificial Tears on Keratometric Measurements in Cataract Patients

Abstract

PATIENT POPULATION: A total of 123 eyes of 80 patients prior to cataract surgery were assigned to 2 groups based on normal and dry eyes. INTERVENTION: Two native baseline keratometries were followed by instillation of either high-or low-viscosity eye drops. Keratometry was repeated 30 seconds, 2 minutes, and 5 minutes after instillation. MAIN OUTCOME MEASURES: Influence of eye drops of different viscosity in normal and dry eyes on short time K-readings.RESULTS: Repeatability between native baseline measurements was high (standard deviation [ 0.02 mm in normal and in dry eyes). In normal and dry eyes, a statistically significant increase in measurement variability after instillation of both low-viscosity and high-viscosity eye drops was observed (P < .01). Measurement variability was most pronounced between baseline measurement and 30 seconds and diminished over time. Variability of K-readings appeared higher in dry eyes compared with normal eyes. Astigmatism changed more than 0.5 diopters in 13.2% of normal eyes and 34.4% in dry eyes using eye drops of high viscosity.CONCLUSION: Tear film-stabilizing eye drops prior to keratometry measurements influenced K-readings significantly, especially in dry eyes. A time period of more than 5 minutes should be allowed to pass after instillation of eye drops. The higher the viscosity of the eye drops, the stronger the influence and the longer its persistence.

Effects of Rebamipide on Differences in Power and Axis of Corneal Astigmatism Between Two Intra-patient Keratometric Measurements in Dry Eyes

“…The intention behind this is to make the surface of the cornea smoother and to stabilize the tear film. However, Röggla et al [30] demonstrated that instilling artificial tears prior to keratometry measurements significantly affected the astigmatism power, particularly in dry eyes. They suggested that keratometric measurements should be performed more than 5 min after HOA higher-order aberration, TBUT tear breakup time artificial tear administration and insisted that the higher the viscosity of the eye drops, the greater and longer their influence.…”

Bell paralizili hastalarda korneal morfolojik ve topografik değişikliklerin değerlendirilmesi

“…Keratometric alterations in patients with dry eye remain controversial. The influence of artificial tears on keratometric measurements in dry eye patients comprised the majority of the studies and demonstrated either similar or increased K-values compared to healthy controls [25][26][27]. Röggla et al [27] assessed the influence of artificial tears on K-readings and observed that the influence of higher viscosity eye drops is stronger and more persistent.…”

“…The influence of artificial tears on keratometric measurements in dry eye patients comprised the majority of the studies and demonstrated either similar or increased K-values compared to healthy controls [25][26][27]. Röggla et al [27] assessed the influence of artificial tears on K-readings and observed that the influence of higher viscosity eye drops is stronger and more persistent. On the other hand, Sanal Dogan et al [25] observed excellent repeatability among all topography parameters including keratometric measurements in dry eye patients compared to healthy controls.…”

Acs asaru plēvītes osmolaritāte pēc kataraktas operācijas. Promocijas darbs

“…Keratometrija ir metode, kas izvērtē radzenes centrālās refraktīvās īpašības. Tieši radzenei piemīt vislielākā staru laušanas spēja cilvēka acī, tādēļ keratometrijas rādītāji ir svarīgi precīza IOL aprēķina nodrošināšanā(Röggla et al, 2021). Riska faktors, kas ietekmē keratometrijas aprēķinus, ir SAS jeb acs virsma (p = 0,05).…”

“…Citā pētījumā tika apskatīta mākslīgo asaru ietekme uz keratometrijas mērījumiem. Zīmīgi, ka pēc mākslīgo asaru iepilināšanās pētāmajā acī SAS pacientu grupā keratometrijas rezultāti mainījās par vairāk nekā 0,5 D 34 % pacientu, turpretī pacientiem ar veselu acs virsmu šādas izmaiņas tika novērotas tikai 13 % gadījumu.Secinājumos tika apstiprināta SAS sindroma nenoliedzama ietekme uz keratometrijas mērījumiem, kā arī rekomendēta mākslīgo asaru lietošana pacientiem, kas ir riska grupā, vismaz 5 minūtes pirms keratometrijas veikšanas, lai iegūtu pēc iespējas precīzākus IOL aprēķina rezultātus(Röggla et al, 2021).Akurāta IOL aprēķināšana, apzinoties riska faktorus, ir noteicoša, lai sasniegtu mērķa refrakciju pēc operācijas.1.…”