Seiko Epson
Provisional entry — research in progress
This page was generated automatically from cited public sources and hasn't completed the full research pass yet. Every specification shown carries its source; more detail is added as research completes.
The Seiko Epson WAM 5500 is a binocular accommodation auto refractometer/keratometer, an ophthalmic instrument designed to measure refractive error and corneal curvature. The instrument allows the patient to maintain natural binocular vision during measurement, which helps eliminate instrument-induced accommodation and provides accurate refraction examination.[1]
The WAM 5500 is also equipped with functions that enable the measurement of far and near distance refractive power as well as the simultaneous measurement of pupil diameter. The instrument is marketed under the Seiko Epson brand and is manufactured by Rexxam Co., Ltd., a Japanese ophthalmic device OEM.[1][2]
The WAM 5500 measures refraction using a binocular viewfinder that presents a fixation target to the patient while the instrument captures spherical (S), cylindrical (C), and axis (A) values. The refractive measurement range is -22 D to +22 D with selectable steps of 0.01 D, 0.12 D, and 0.25 D. Corneal curvature radius is measured from 5.0 mm to 10.0 mm, corresponding to corneal refractive powers of 33.75 D to 67.5 D. The instrument can also measure pupil diameter in a range of 2.0 mm to 8.0 mm with 0.1 mm steps.[1]
The instrument features a high-speed mode that, when connected to a computer, can continuously measure the spherical equivalent (SE) value and pupil diameter at 0.2-second intervals. An accommodation mode allows simultaneous measurement of pupil diameter and refractive value, enabling assessment of miosis and mydriasis occurring with accommodation. The measurement time for refractive measurement is approximately 0.07 seconds, for pupil diameter approximately 0.07 seconds, and for corneal curvature radius approximately 2.2 seconds.[1]
Site utility requirements, footprint, and infrastructure needed to install and operate this tool. Sourced from public records.
Generated from public-source data on file. Enter your email to access — nothing is published; details are routed privately.
No research found yet — worked with this tool? Share what you know.
The refractive measurement range is -22 D to +22 D (VD=0) with selectable steps of 0.01 D, 0.12 D, and 0.25 D.[1]
The dimensions are 327 mm (W) × 496 mm (D) × 515 mm (H), and the weight is approximately 20 kg.[1]
Yes, the WAM 5500 can measure pupil diameter simultaneously with the refractive value, with a measurement range of 2.0 mm to 8.0 mm and a step of 0.1 mm.[1]
In high-speed mode, the spherical equivalent (SE) value and pupil diameter are measured at 0.2-second intervals when connected to a computer.[1]
The instrument provides an RS-232C interface for data output.[1]
The power requirement is AC 100–240 V, 50/60 Hz, with a maximum power consumption of 80 VA.[1]
The following facts about the WAM 5500 are absent from this record as of this revision. First-hand knowledge or a citation closes a gap; every submission is reviewed before publication.
No publicly documented production dates or lifecycle milestones (introduction, end of production, EOL) for the WAM 5500 are on record.
Answerable by: OEM historical records or a trade-press announcement
No publicly documented variants, configuration options, or revision breakpoints of the WAM 5500 are on record.
Answerable by: an OEM product catalog or an engineer who ordered or specified the tool
The control-system platform and OS era of the WAM 5500 are not on record.
Answerable by: an engineer who operated it or OEM installation records
No publicly documented failure modes or field errata for the WAM 5500 are on record.
Answerable by: a field service engineer, process engineer, or maintenance technician
The process node or technology generation of the WAM 5500 is not on record.
Answerable by: an OEM datasheet or a fab qualification report
No research found yet — worked with this tool? Share what you know.
Last updated Sep 26, 2026.