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ENT, Ophthalmic & Sensory
Visionstar SL-232A4

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Visionstar ENT, Ophthalmic & Sensory

Visionstar SL-232A4

Product Code: EOAS-OAVT-3568

Four kilograms of trial lenses, carried to the patient's own chair.

Take refraction to the patient: a 4.0 kg case holds spheres to 20.00 D, square-cut cylinders and prisms that keep their marked orientation, and a binocular vision accessory row, all at a 21 mm clear aperture.

Sections

Trial Lens Sets & Frames

Categories

ENT, Ophthalmic & Sensory

Condition

New

Origin

China

Seller Type

Certified Professional Seller

CE & ISO Certified

Global Shipping

Supplier: Medigear

Within Visionstar's trial lens catalogue, the SL-232A4 is a reduced-aperture set built around a 21 mm clear zone. Convex spheres run in pairs from 0.12 D in 0.25 D steps to 6.00 D, in 0.50 D steps to 8.00 D and in 1.00 D steps to 14.00 D, then 16.00, 18.00 and 20.00 D. Cylinders run in pairs from 0.12 D to 3.00 D in 0.25 D steps, then 3.50 and 4.00 D. There is no 3.25 D cylinder, and no 8.50 or 9.50 D sphere. Twelve prisms and twelve accessories complete the list. The concave sphere range is ambiguous on the sheet, as the FAQs explain.

The set is shaped for a particular caseload: routine refraction, most of it in low and moderate astigmatism, carried between rooms or to a home. At 4.0 kg the kit travels in one hand, and the 21 mm aperture keeps each lens small enough to sit comfortably in a compact trial frame. The cost of that focus is a cylinder ceiling of 4.00 D, which a hospital service seeing high or post-surgical astigmatism will reach.

Cylinder and prism optics are cut square, which the manufacturer states prevents rotation, and every lens is fixed by an ultrasound melt process. Powers are printed on one side of each handle. Accessories comprise red and green filters, a plane lens, a black lens, two cross-line pieces, a white Maddox rod, a frosted lens, a pinhole, a slit and two cross cylinders. No trial frame appears in the written configuration.

The case measures 470 × 270 × 90 mm and the tray 450 × 335 × 30 mm. Medigear.uk lists the SL-232A4 and can arrange delivery worldwide. Request written confirmation of the concave sphere range, the packing list, rim outer diameter and the declaration of conformity from the seller before order.

Domiciliary eye care is the clearest fit. A registered optometrist visiting a care home or a housebound patient carries a trial frame, a retinoscope, an ophthalmoscope and a chart as well as the lenses, and a 4.0 kg set keeps that load manageable. Refraction happens in the patient's own chair, where most of the people on a domiciliary list are best examined.

Community optometry practices use a set like this for routine subjective refraction, for checking a phoropter result in a trial frame, and for letting a patient look around the room in a new prescription before it is dispensed. Paired powers let both eyes hold the same lens during binocular balancing.

Outreach, school and screening programmes need a complete set that moves between venues. Where those programmes see children, the set supports retinoscopy with working lenses and a check of the result in a small trial frame, while objective and cycloplegic methods carry the measurement in younger children.

Binocular vision assessment uses the accessory row. The white Maddox rod, the red and green filters and the twelve prisms allow heterophoria measurement and prism trials in free space.

Teaching clinics gain a set whose lenses all read from one printed side, which simplifies the routine a student learns first.

Two settings are weaker fits. Hospital services seeing high astigmatism after keratoplasty or cataract surgery will reach the 4.00 D cylinder ceiling, and low vision clinics working with eccentric viewing will find the 21 mm aperture restrictive. Institutional buyers commonly ask for evidence of conformity before purchase. The conformity documentation those procurement routes require is issued by the manufacturer and provided by the seller.

Light Enough to Travel Every Day

At a listed 4.0 kg, the complete set goes out on a domiciliary round without adding much to a kit that already carries a retinoscope, an ophthalmoscope and a chart. One practitioner can manage it alongside the rest of the equipment.

Built Around the Routine Caseload

The cylinder range concentrates on the low and moderate powers that most astigmatic patients need, in 0.25 D steps to 3.00 D. Population studies consistently find high astigmatism in a small minority of patients, so the range covers the everyday refraction a community or domiciliary service performs.

Small Lenses for Compact Frames

A 21 mm clear aperture keeps each lens small and light. That suits compact trial frames and narrow faces, and it keeps a stack of sphere, cylinder and prism from tipping the frame forward.

Marked Orientation That Holds

Cylinder and prism optics are square-cut and fixed by an ultrasound melt process, which the manufacturer states prevents rotation. The axis marking on a cylinder and the base marking on a prism stay aligned with the optic after years of handling.

A Consistent Reading Face

Each power is printed on one side of the handle. The practitioner learns to read every lens from the same face, which speeds lens selection in a dim room.

Binocular Vision Work Without a Second Kit

The Maddox rod, filters, cross-line pieces and prisms share the tray with the refraction lenses. A heterophoria measurement or a prism trial can follow refraction on the same visit.

Nothing to Plug In or Inspect

The set has no electrical parts. It needs no mains supply at a patient's home, never enters a portable appliance testing schedule and carries no statutory inspection interval.

Paired Powers Throughout

Every sphere and cylinder power comes as a pair, so both eyes can carry identical corrections during binocular balancing and the final check.

Convex Sphere Range

Thirty-eight convex sphere powers, two of each, from 0.12 D to 20.00 D. Steps are 0.25 D to 6.00 D, 0.50 D to 8.00 D and 1.00 D to 14.00 D, followed by 16.00, 18.00 and 20.00 D.

Concave Sphere Range

A concave column from 0.12 D to 4.50 D is clearly labelled. Whether the 4.75 D to 20.00 D column belongs to the concave spheres is ambiguous on the datasheet, and the seller should confirm it in writing.

Cylinder Range

Fifteen cylinder powers in each sign, two of each: 0.12 D, 0.25 D to 3.00 D in 0.25 D steps, then 3.50 and 4.00 D. No 3.25 D cylinder is listed.

Prism Set

Twelve prisms. The 0.50, 1.00 and 2.00 values come in pairs, and 3.00 to 8.00 in whole steps come singly. No unit is printed beside the values, and prism dioptres are the usual convention.

Accessory Lenses

Twelve pieces: red filter, green filter, plane lens, a lens listed as black, two cross-line pieces, a white Maddox rod, a frosted lens, a pinhole, a slit and two cross cylinders.

Cross Cylinders

Two cross cylinders are supplied for refining cylinder axis and power. Their powers are not published.

White Maddox Rod

A white Maddox rod supports heterophoria measurement in the trial frame, used together with the prisms.

Slit, Pinhole and Frosted Lens

A stenopaeic slit locates a principal meridian, a pinhole shows whether reduced acuity is refractive, and a frosted lens blurs one eye while keeping fusion cues.

Red and Green Filters

One red and one green filter support duochrome-style and suppression testing.

21 mm Reduced Aperture

Every lens has a 21 mm clear aperture. The rim outer diameter is not published.

Square-Cut Cylinders and Prisms

Cylinder and prism optics are square, stated by the manufacturer to prevent rotation within the mount.

Ultrasound Melt Fixing

Lenses are secured in their mounts by an ultrasound melt process, which the manufacturer states makes the fixing more secure.

One-Side Power Marking

Powers are printed on a single side of each handle. Durability under repeated disinfection is not published.

Lens Tray

A 450 × 335 × 30 mm tray holds the lenses in rows. The photograph shows blue-green rims across the set.

Carry Case

The case measures 470 × 270 × 90 mm and has a carry handle. The case material is not stated.

The SL-232A4 is a set for the routine caseload carried to wherever the patient is: spheres to 20.00 D, cylinders concentrated in the low and moderate range, a binocular vision accessory row and a 21 mm aperture, all at a listed 4.0 kg. It is a poorer fit for high astigmatism and eccentric viewing, and the datasheet leaves the concave sphere range, the piece count and the frame question open. Medigear.uk lists the SL-232A4 for business buyers worldwide and can arrange delivery, familiarisation and service cover. Request written confirmation of the lens ranges, the packing list, rim outer diameter, replacement lens pricing 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 table does not settle it. As drawn, the concave sphere heading sits over a single column running from 0.12 D to 4.50 D, and the column running from 4.75 D to 20.00 D falls under the convex cylinder heading. Read literally, that would give concave spheres stopping at 4.50 D and convex cylinders reaching 20.00 D, which is not how a trial lens set is normally composed. The more likely reading is that concave spheres mirror the convex range to 20.00 D and cylinders stop at 4.00 D, but that is an inference from the layout rather than a published statement. Ask the seller to confirm the concave sphere and convex cylinder ranges in writing, because a myope above 4.50 D cannot be refracted without the higher minus powers.

The heading states 232 pieces. On the likely reading of the table, the itemised powers add up to 236: 152 spheres, 60 cylinders, 12 prisms and 12 accessories. The sheet does not explain the four-piece gap. Ask for the packing list that ships with the order and check the tray against it on arrival.

It suits practitioners whose caseload is mostly routine: community practices, domiciliary services and outreach teams refracting adults and older children with low to moderate astigmatism. The 4.0 kg case and the small 21 mm lenses favour work away from a fixed test room. It suits a hospital eye service less well where high astigmatism after keratoplasty or cataract surgery is common, because the cylinders stop at 4.00 D. For context, the US Multi-Ethnic Pediatric Eye Disease Study found astigmatism of 3.00 D or more in the worse eye in 1.2% of African American and 3.0% of Hispanic children aged six months to six years.

A caption beneath the product photograph appears to refer to a design for children, and the photograph shows a small trial frame. The written features say nothing about paediatric use, so treat the caption as an indication to ask about rather than a specification. Clinically, the College of Optometrists advises that refractive error in young children is often only measurable by objective means, with cycloplegic drops where needed. In a younger child the set supports retinoscopy and a check of the result in a trial frame more often than a full subjective refraction.

The written configuration lists lenses only. The photograph shows at least one trial frame, and photography is not a packing list. Assume no frame unless the quotation names one as a line item, and if one is quoted, ask for its size range and whether its cells accept these lenses.

Fit depends on the rim outer diameter and rim thickness, and the datasheet publishes neither. Separate online listings for the same model code give a 25 mm aperture, a 38 mm rim and a larger case, which disagree with the datasheet's 21 mm and 470 × 270 × 90 mm. Treat the datasheet as the reference, and ask the seller to confirm aperture, rim diameter and case size in writing before order. A lens that sits loose in a cell turns or drops out during a head movement.

By combining two lenses, for example 8.00 D with 0.50 D, in the same cell or adjacent cells. Stacking works, but it adds lens surfaces and moves the second lens further from the eye, which alters the effective power at high values. For the occasional high prescription this is routine practice. For a service that refracts many high myopes or aphakic patients, the 1.00 D steps above 8.00 D are worth weighing before order.

Under the UK Opticians Act 1989, testing of sight is restricted. The General Optical Council holds that refraction is a core component of the sight test, reserved to registered optometrists, registered medical practitioners and supervised student optometrists. Its current consultation on the testing of sight statement does not propose delegating subjective refraction for prescribing. Other countries set their own rules, and buyers should check with their own professional regulator.

The reference product standard is BS EN ISO 9801:2009, covering full and reduced aperture trial case lenses, which ISO last confirmed in 2024. The datasheet claims no conformity to it. Under UK MDR 2002 the set 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.

There are no electrical parts, so the set sits outside electrical safety and portable appliance testing. In a UK workplace it is covered by PUWER 1998, like any other work equipment. The useful routine is a periodic power check on a focimeter, with any chipped, scratched or loose lens withdrawn and replaced. Replacement availability and pricing for single lenses are not published, so ask at quotation.

Lenses never touch the eye, but handles are held at every appointment and the frame rests on the face. Disinfectant compatibility is not published for the lenses, rims or printed power marks. Ask the seller which agents the manufacturer permits, since a wipe that lifts the printing leaves a lens that cannot be identified.