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ENT, Ophthalmic & Sensory
Visionstar RS-4R42

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Visionstar ENT, Ophthalmic & Sensory

Visionstar RS-4R42

Product Code: EOAS-OAVT-3630

Is it really neutral? Add a quarter and watch the reflex answer.

Settle the retinoscopy end-point in one move: plus and minus 0.25 D and 0.50 D on a single white bar, held over the neutralising lens to show which way the reflex turns before the objective result is trusted.

Sections

Retinoscopes

Categories

ENT, Ophthalmic & Sensory

Condition

New

Origin

China

Seller Type

Certified Professional Seller

CE & ISO Certified

Global Shipping

Supplier: Medigear

Four lenses on one white bar make up the RS-4R42 from Visionstar: +0.25, +0.50, −0.25 and −0.50 D. The datasheet names retinoscopy as the main use, watching the fundus reflex move through each aperture. The photograph shows the powers printed beside their apertures. Aperture diameter, lens and bar material, dimensions, weight and any case are not published, and nothing else is listed, so the bar is best treated as a single accessory to an existing refraction set.

The bar works as a confirmation tool. When the practitioner believes neutral has been found, holding +0.25 D over the eye should turn the reflex to against-motion, and −0.25 D should turn it to with-motion. If both happen, the end-point sits within a quarter dioptre. If the reflex does not reverse, neutral lies further along, and the 0.50 D lenses show which way to move. That check matters because published repeatability of retinoscopy is wider than a quarter dioptre. The bar does not replace subjective refinement.

The four powers cover only the fine end of the range. The bar cannot neutralise a refractive error on its own and is used alongside a trial lens set, a rack of higher powers or a phoropter. The same powers are also commonly used for plus and minus checks at the end of a subjective refraction, though the datasheet does not name that use.

Medigear.uk lists the RS-4R42 and can arrange delivery worldwide. Request the aperture diameter, dimensions, material, sign marking and declaration of conformity from the seller before order.

Optometry practices use a low-power bar at the end of retinoscopy to confirm the neutral point before moving to subjective refraction. A quick plus and minus check tells the practitioner whether the objective result can be trusted as a starting point, which saves time in the subjective routine that follows.

Paediatric and special-needs clinics rely heavily on retinoscopy, often under cycloplegia, because subjective responses may be limited or absent. For those patients the objective result may become the prescription, so confirming neutral within a quarter dioptre matters more than usual.

Hospital eye services and orthoptic clinics use the same confirmation step when refracting children with strabismus or amblyopia, where an accurate result underpins treatment decisions.

Training clinics for optometry and ophthalmology students use the bar to teach how the reflex changes either side of neutral. Students can see against-motion appear with a quarter dioptre of plus and with-motion with a quarter of minus, which builds confidence in judging the end-point.

Practitioners who also use ±0.25 D and ±0.50 D lenses for plus and minus checks at the end of a subjective refraction may find the bar convenient for that, though the datasheet names retinoscopy only.

The bar suits a buyer expecting a complete neutralisation tool less well, since four low powers cannot neutralise most eyes alone, and it needs a lens set or higher-power rack alongside. Institutional buyers commonly ask for evidence of conformity. The conformity documentation those procurement routes require is issued by the manufacturer and provided by the seller.

Quick Confirmation of Neutral

A quarter dioptre of plus or minus shows at once whether the reflex has truly neutralised.

Brackets the End-Point

With both 0.25 D and 0.50 D in each sign, the practitioner can bracket the neutral point and see which way to adjust.

Four Powers in One Bar

All four confirmation lenses sit in a single bar, so nothing needs to be picked out of a trial case mid-examination.

Improves Objective Precision

Published repeatability of retinoscopy is wider than a quarter dioptre, and a confirmation step tightens the result before subjective refinement.

Valuable Where Subjective Testing Is Limited

In young children and special-needs patients, the objective result may become the prescription, which makes a confirmed end-point especially useful.

A Clear Teaching Aid

Students can watch the reflex reverse either side of neutral, which makes the concept concrete.

Printed Power Labels

The photograph shows each power printed beside its aperture.

No Electrical Upkeep

The bar has no electrical parts, needs no mains supply and never enters a portable appliance testing schedule.

Plus Powers

+0.25 D and +0.50 D.

Minus Powers

−0.25 D and −0.50 D.

Lens Count

Four apertures in the photograph, one per power.

Bar

A single white bar, per the photograph.

Power Labels

Printed beside each aperture, per the photograph. Sign colour coding is not stated.

Aperture Diameter

Not published.

Lens Material

Not published.

Bar Material

Not published.

Intended Use

Retinoscopy, watching the reflex move through each aperture, per the datasheet.

Case

None listed.

Dimensions and Weight

Not published.

Power Source

None. The bar has no electrical parts.

The RS-4R42 is a single white bar carrying +0.25, +0.50, −0.25 and −0.50 D, built for one job: confirming that a retinoscopy reflex has truly neutralised before the result is relied on. Retinoscopy's published repeatability makes that quarter-dioptre check worthwhile, particularly where the objective result becomes the prescription. The bar complements a lens set or rack and does not replace one, and it earns its place in the moments before a result is written down. Medigear.uk lists the RS-4R42 for business buyers worldwide and can arrange delivery, familiarisation and service cover. Request the aperture diameter, dimensions, material, sign marking and the declaration of conformity from the seller at quotation.

FAQ

Frequently Asked Questions

Everything buyers need to know about sourcing medical equipment through MediGear.

The datasheet lists four powers: +0.25, +0.50, −0.25 and −0.50 D. The photograph shows them as four round apertures in a single white bar with the power printed beside each. No case, handle attachment or additional lenses are listed.

At the apparent neutral point, the practitioner holds the +0.25 D aperture over the eye. If neutral is correct, the reflex turns to against-motion. The −0.25 D aperture should then produce with-motion. When both responses appear, the neutral point is confirmed to within a quarter dioptre, and the working-distance allowance is then subtracted as usual. If a 0.25 D lens produces no reversal, the 0.50 D lenses show which direction the true neutral lies.

Because retinoscopy is less precise than a single quarter-dioptre step. A study of 40 adults by Zadnik and colleagues found that repeated cycloplegic retinoscopy on separate occasions had 95% limits of agreement of about ±0.95 D. A comparison with subjective refraction reported limits of about ±0.65 D. A study of student examiners found mean differences of a quarter dioptre or less, but limits of agreement wider than 1 D. A quick bracket with ±0.25 D tightens the objective result before subjective refinement begins.

No. With only four low powers, it cannot neutralise most refractive errors on its own. Neutral is reached first with a lens set, a rack of higher powers or a phoropter. The RS-4R42 then confirms and fine-tunes that result.

The datasheet names retinoscopy only. In practice, ±0.25 D and ±0.50 D lenses are the powers used to check a subjective end-point, for plus and minus checks and during binocular balancing. If you intend to use the bar that way, confirm with the seller that aperture size and optical quality suit subjective viewing.

The photograph shows each power printed beside its aperture. Whether plus and minus are distinguished by colour is not clear from the image and is not stated. Confirm the marking, since picking up the wrong sign reverses the meaning of the check.

Not published. The photograph shows round apertures, but their clear diameter and the lens and bar materials are not stated. A larger aperture makes the reflex easier to judge, so ask for the figure.

Hold it perpendicular to the line of sight, close to the spectacle plane and over the neutralising lens. At these low powers, small tilts and distance changes have little effect, but a steady position makes the reflex easier to read.

BS EN ISO 9801:2009 covers trial case lenses, and the datasheet does not claim conformity to it for this bar. Under UK MDR 2002 it is typically Class I, or higher, use-dependent, confirmed against the declaration of conformity at order. The declaration is issued by the manufacturer and provided by the seller. Conformity requirements differ by destination market, and the seller confirms what applies where the unit is going.

Optometrists, ophthalmologists and refracting clinicians use low-power confirmation lenses, and training clinics use them to teach neutralisation. In the UK, refraction for a prescription within a sight test is restricted under the Opticians Act 1989 to registered optometrists and registered medical practitioners, with student optometrists working under supervision. Other countries set their own rules.

The bar has no electrical parts, so it sits outside electrical safety and portable appliance testing, and in a UK workplace PUWER 1998 applies as it does to any work equipment. Clean it between patients, check lenses for scratches, and store it where the printing will not wear. Disinfectant compatibility and replacement pricing are not published.

A practitioner looking for a complete retinoscopy tool will need a lens set or rack of higher powers, since four low powers cannot neutralise most eyes alone. A buyer who needs a published aperture size or documented sign marking should obtain them in writing before order.