Auto kerato refractometer kr 8800

Participants’ visual acuity was measured with and without their glasses at a 4 m distance using Jin’s vision chart. When the visual acuity value did not reach the threshold of 0.8, the best-corrected visual acuity was measured using the Auto Kerato-Refractometer (KR-8800; TOPCON Corporation, Tokyo, Japan) and the pinhole test. Both eyes were examined separately. In this study, we used the best-corrected visual acuity of the better eye for further analysis. Visual acuity >0.5 was defined as good, and visual acuity <0.5 was defined as poor. This value (0.5) represents the approximate lower 10% of visual acuity in the study participants as well as the cut-off value of visual impairment, according to other studies.12 13 (link)

All participants were interviewed regarding their medical history, and underwent a complete ophthalmic examination, included measurement of BCVA, refractive status using an auto refractometer (Auto Kerato-refractometer KR-8800; Topcon, Tokyo, Japan), AL using an IOLMaster (Carl Zeiss Inc, Jena, Germany), IOP using non-contact tonometer measurements (Full Auto Tonometer TX-F; Topcon, Tokyo, Japan), slip-lamp biomicroscopy examination, fundus examination (TRC-NW200, Topcon), together with measurements of RNFL and GCC thickness (RTVue-XR OCT; Optovue Inc, Fremont, California, USA). Calculation of the mean spherical equivalence (MSE) using the spherical dioptre plus one-half of the cylindrical dioptric power for later analysis. IOP, pulse rate (PR) and blood pressure (BP) were measured at the time of OCT imaging. BP amplitude was calculated as the systolic BP (SBP) minus the diastolic BP (DBP). The mean arterial pressure (MAP) was calculated with the following formula: MAP=DBP+0.42 (SBP−DBP).24–26 (link) The ocular perfusion pressure (OPP) was calculated by subtracting the IOP from the two-third of the MAP.27 (link)