Clinical evaluation of the Shin‐Nippon SRW‐5000 autorefractor in adults

Abstract

A clinical evaluation of the Shin-Nippon SRW-5000 (Japan), a newly released commercial autorefractor, was undertaken to assess its repeatability and validity compared to subjective refraction. Measurements of refractive error were performed on 200 eyes of 100 subjects (aged 24.4 +/- 8.0 years) subjectively (non-cycloplegic) by one optometrist and objectively with the SRW-5000 autorefractor by a second. Repeatability was assessed by examining the differences between the seven autorefractor readings taken from each eye and by re-measuring the objective prescription of 50 eyes at a subsequent session. Although the SRW-5000 read slightly more plus than subjective refraction (mean spherical equivalent +0.16 +/- 0.44 D), it was found to be highly valid (accurate) compared to subjective refraction and repeatable over the prescription range of +6.50 to -15.00 D examined. The Shin-Nippon SRW-5000 autorefractor is therefore a valuable complement to subjective refraction and as it offers the advantage of a binocular open field-of-view, has a great potential benefit for accommodation research studies.

Off-axis refraction and aberrations following conventional laser in situ keratomileusis

“…24,25 This is reported to give off-axis refractions similar to those of another autorefractor and a laboratory Hartmann-Shack instrument. 26 Each subject was carefully aligned to the axis of the instrument.…”

Autorefraction after implantation of diffractive multifocal intraocular lenses

“…Because refraction measured with an autorefractor is widely used to approximate refractive error and is the starting point for the manifest refraction examination, the accuracy and reliability should be determined. [1][2][3][4] The popularity of multifocal intraocular lens (IOL) implantation has been increasing with the introduction of new-generation diffractive multifocal IOLs that provide excellent uncorrected near visual acuity (UNVA) and UDVA. [5][6][7][8] In contrast to monofocal IOLs, it is necessary to consider whether a conventional diagnostic technique can be applied to the refractive and diffractive design of multifocal IOLs.…”

Effect of unilateral forced nostril breathing on tonic accommodation and intraocular pressure

“…The binomial test showed that the probability that IOP in 10/17 observations would change in the predicted direction (i. e. an IOP increase with left UFNB application) was significant (p = 0.015). There were no significant interocular differences in base-line IOP (t 16 Changes in IOP via UFNB were not significantly correlated with changes in TA (r = 0.1, p = 0.704 for right UFNB; r = 0.332, p = 0.193 for left UFNB). In addition, right and left UFNB produced no significant effect on heart rate, systolic and diastolic blood pressure.…”

“…It measures refractive error by image analysis of a ring of infrared radiation reflected from the retina. Accommodation readings measured with the Shin-Nippon autorefractor have high validity and repeatability in both adults [16] and children [7]. The autorefractor was used in a static mode and accommodation was recorded at approximately 2-second intervals.…”