TY - JOUR
T1 - Variations in keratometric values (K-value) after administration of three different eye drops
T2 - effects on the intraocular lens calculations in relation to cataract surgery
AU - Jensen, Mia N.
AU - Søndergaard, Anders Peter
AU - Pommerencke, Claus
AU - Møller, Flemming
PY - 2020/9
Y1 - 2020/9
N2 - Purpose: To investigate the variance in keratometric (K) values after administration of different eye drops (three tested), and the effects on intraocular lens (IOL) power calculations in relation to standard cataract surgery. Methods: A prospective intervention study (pilot study) on 38 participants (22 women, 16 men, 58–88 years) undergoing 57 cataract surgeries. Three keratometries on each eye were performed: a baseline (‘standard’) keratometry about 9 weeks preoperatively, and two on the operation day; a ‘dry’-measurement before interventions and a ‘wet’-measurement after applying one of three eye drops (saline, Systane Ultra®, or Systane Complete®). All standard cataract operations were uneventful. Variabilities in K-values, spherical equivalents (SEQs) for IOL power calculations (Barrett TK Universal II) and subjective manifest refractions (SRs) 6 weeks postoperatively were compared between groups. Results: The ‘wet’ K-values had a similar variability to those of the ‘standard’ and ‘dry’ K-values (p > 0.05, anova on ranks). The mean paired differences in K-measurements between groups ranged within a small interval from −0.0107 to 0.0096 mm. After comparing the SEQ predictions with SR-measurements, the most precise IOL calculation was achieved after administration of a saline eye drop, but the precision was not statistically improved compared to the other drop modalities. Conclusion: The variability in K-values was not significantly changed by administration of any of the different eye drops tested, suggesting that artificial eye drops do not impact the keratometry or IOL power prediction.
AB - Purpose: To investigate the variance in keratometric (K) values after administration of different eye drops (three tested), and the effects on intraocular lens (IOL) power calculations in relation to standard cataract surgery. Methods: A prospective intervention study (pilot study) on 38 participants (22 women, 16 men, 58–88 years) undergoing 57 cataract surgeries. Three keratometries on each eye were performed: a baseline (‘standard’) keratometry about 9 weeks preoperatively, and two on the operation day; a ‘dry’-measurement before interventions and a ‘wet’-measurement after applying one of three eye drops (saline, Systane Ultra®, or Systane Complete®). All standard cataract operations were uneventful. Variabilities in K-values, spherical equivalents (SEQs) for IOL power calculations (Barrett TK Universal II) and subjective manifest refractions (SRs) 6 weeks postoperatively were compared between groups. Results: The ‘wet’ K-values had a similar variability to those of the ‘standard’ and ‘dry’ K-values (p > 0.05, anova on ranks). The mean paired differences in K-measurements between groups ranged within a small interval from −0.0107 to 0.0096 mm. After comparing the SEQ predictions with SR-measurements, the most precise IOL calculation was achieved after administration of a saline eye drop, but the precision was not statistically improved compared to the other drop modalities. Conclusion: The variability in K-values was not significantly changed by administration of any of the different eye drops tested, suggesting that artificial eye drops do not impact the keratometry or IOL power prediction.
KW - cataract
KW - dry eyes
KW - eye drop
KW - intraocular lens power calculation
KW - keratometry
KW - refraction
KW - spherical equivalent
KW - tear film
U2 - 10.1111/aos.14408
DO - 10.1111/aos.14408
M3 - Journal article
C2 - 32189448
AN - SCOPUS:85081976519
SN - 1755-375X
VL - 98
SP - 613
EP - 617
JO - Acta Ophthalmologica
JF - Acta Ophthalmologica
IS - 6
ER -