Keeler Symphony K Series Slit Lamp

Quick Overview

Keeler is known for exceptional design ability and has combined classic beauty with modern technology, resulting in the perfect blend of style and substance.

Keeler Symphony Slit Lamps provide the functionality and performance you want, need and expect from a Slit Lamp.

The controls are perfectly placed for ease of use, without compromising the clean and elegant lines of the product. Keeler's design flair gives the product a sleek, beautiful profile.

Keeler is renowned for market-leading optics and has been dedicated to optical design and manufacture for nearly 100 years. Keeler customers have absolute confidence in the quality, accuracy and reliability of their optical design system and the performance it delivers.

Their advanced design and manufacturing techniques give Keeler Symphony Slit Lamps the advantage of quite simply stunning optical performance.

We understand how important the Slit Lamp is to your practice. You rely on it to provide accurate diagnostic and examination results day in, day out. Failure is simply not an option. With Keeler Symphony, you can rest assured that our exceptional attention to detail, on every single component, will ensure optimum performance and reliability time after time. You also benefit from the added confidence of knowing your Keeler Symphony is backed by Keeler's 3-year guarantee.


  • Refraction and Combi-unit ready: Attaching the Symphony Slit Lamp to your unit couldn’t be easier. We’ve kept the technician front of mind when developing the fitting mechanics to ensure you can be up and running in no time. Our unique Slit Lamp power management system allows input from both DC (direct current) and AC (alternating current) sources to give a 6V DC, 12V DC or a constant current (CC) output.
  • Integrated Yellow Filter: Ease of use is key to Keeler’s product development. This is why our designers have integrated the all-important yellow filter into the optical body. You simply need to ‘drop it in’ when you are looking to detect subtle corneal staining - no more fumbling around with hand held written filters.
  • Built in diffuser: The Symphony Slit Lamp has been built with an integrated diffuser in the filter wheel. Another nice design touch – instant access to a diffuse light which gives an improved general overview of the eye under examination.
  • On board illumination control: The illumination control panel has been placed close to the joystick, giving you convenient and constant access to this vital control.

Part Number

Keeler Symphony K Series Slit Lamp

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Optical System


Galilean converging binoculars @ 8° or Galilean 0° parallel

Magnification: Rotating drum change x6, x10, x16, x25 & x40 with 3 step or 5 step options
Eyepiece: x12.5  Adjustment +/-8D 
Field of view: 34 mm, 22 mm, 14 mm, 8.5mm, 5.5 mm
Interpupillary distance: 49.0mm to 77.0mm (converging), or 38.0mm to 85mm (parallel)
Objective lens focal distance: 107mm
Objective lens convergence angle: 13°

Slit Projection System & Base

Slit width:

0-12mm continuously variable (K & Q series) 0-14mm continuously variable (Z series)

Slit length: 12mm (1.0mm – 12mm continuously variable)
Aperture diameters: 0.2mm, 1mm Square, 2mm, 3mm, 5mm, 9mm and 12mm (14mm replaces the 12mm for the Z series)
Filters: Clear; red free; neutral density; diffuser; blue; IR heat
absorbing filter permanently installed in K and Q series only
Slit rotation K and Q series: +/- 180° continuous with reference scale
Slit rotation: 360° continuous with reference scale
Slit vertical tilt (K & Q series): 0°, 5°, 10°, 15° & 20°
Base travel: 25mm Z-axis, 107mm X-axis, 110mm Y axis.
Horizontal fine adjustment: 12mm
Table top dimensions: 405 x 500mm
Fixation lamp: LED
Light source: LED. 6V 20W or 12V 30W Halogen lamp option for K and Q series

Weight, Packed (approx.)

Slit Lamp, complete with table top:

26.0Kg (max), 90 x 58 x 45cm W x D x H (external)

Protection Against Ingress


Class II ME Equipment

Insulation between mains parts and the functional earth provide at least two means of protection.

Power Supply

Power supply unit:

Switch mode, (110V – 240V input) +/- 10% multi plug
compliant to EN60601-1 EN 61000-6-2, EN 61000-6-3

Power supply output: 12V DC: 2.5 amps must be IEC/EN 60601 compliant
Complies with: Electrical Safety (Medical) BS EN 60601-1
Electromagnetic compatibility EN 60601-1-2
Ophthalmic instruments - Fundamental requirements
and test methods ISO 15004-1:2006
Ophthalmic instruments - Optical radiation hazard ISO





Use: +10°C to +35°C 30% to 90% 800 hpa to 1060 hpa
Storage: -10°C to +55°C 10% to 95% 700 hpa to 1060 hpa
Transport: -40°C to +70°C 10% to 95% 500 hpa to 1060 hpa
Symphony Slit Lamp complete on table top
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Symphony Slit Lamp for refraction unit
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Symphony Slit Lamp complete with table leg
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Symphony Slit Lamp Digital Ready
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Symphony Slit lamp Digital
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Keeler Symphony Slit Lamps Product Brochure

Keeler Symphony Slit Lamps Product Brochure


Keeler Slit Lamps Product Miniature Brochure

Keeler Slit Lamps Product Brochure Mini


Keeler Slit Lamp Brochure

Keeler Slit Lamp Range Brochure


Keeler Slit Lamp K Series Technical Specifications Datasheet

Keeler Slit Lamp K Series Datasheet


Keeler Slit Lamp K, Q & Z Series Technical Specifications

Keeler Slit Lamp Series Tech Spec


Keeler Symphony H Series Slit Lamp Instructions For Use

Keeler Symphony H Series Slit Lamp Instructions of Use