Keratron, Corneal Topographer

  • The first topography unit to accurately represent the local curvature calculated by an “arc-step”method.
  • Because of its outstanding precision, test repeatability and capability to highlight even the smallest details, the keratron represents a standard of reference in corneal topography.
  • The 28-ring placido cone allows coverage up to the 80-90% of the corneal surface. The peripheral measurements are extremely important for the analysis of the transition areas in refractive surgery, for the correct simulation of contact lens fitting and for the diagnosis of peripheral alterations.
  • The “arc-step” calculation method, as well as many other proprietary algorithms in the software, allows the measurement of both curvature and height at each point on the cornea with a resolution of one micron or less.
  • The patented eye position control system (epcs) allows image acquisition only at the correct focusing distance; and lateral misalignments are automatically corrected.
  • The large, high-resolution monitor clearly displays the tear film and the still images during examinations, in order to avoid artifacts. It also allows the review of images previously acquired.

Technical Specifications

Videokeratoscope


  • Area of analysis: 10mm x 14mm (visible on the monitor)
  • Keratoscope cone: 28 border mires, equally spaced on a 43d sphere
  • Analysed points: over 80.000
  • Measured points: 7168
  • Corneal coverage: from 0.33mm (minimum diameter on a 43d sphere) up to 11mm on a normal eye
  • Measured area: 90% of the corneal surface (normal eyes)
  • Dioptric power range: from 1d to over 120d
  • Resolution: +/- 0.01d - 1 micron
  • Focusing device: eye positioning control system epcs (patented) automatic acquisition, with decentration correction
  • Tv camera: high resolution (c.c.i.r.)
  • Monitor: 6” b&w
  • Other features: automatic od/os detection, placido ring image available on the b&w screen
  • Weight: 11 kg
  • Accessories included: table top with head rest, calibration kit, foot switch, scout software


Keratron Bridge Unit


  • Power supply: mains (100-110 or 220-240 vac, 50/60hz) to videokeratoscope (+5, +12, -12vdc)
  • Image acquisition: acquisition through footswitch and epcs, digital conversion and storage (freeze) on b&w monitor
  • Pc-vk link: through usb port
  • Software: scout release 3.2 or higher
  • Computer (recommended minimalfeatures)
  • Environment: ms windows 2000/xp or vista
  • Processor/memory: pentium iii 450mhz, 64 mb ram
  • Disks: internal 10 gb hd, internal 8x cd-rom
  • Monitor: super vga color monitor 14”, 1024x768 points, 16 million colors
  • Printer: ink jet
  • Port: usb port


Software


  • Dioptric scale: absolute, normalized, adjustable
  • Keratometric values and indices: sim k-readings, meridians, hemimeridians, maloney indices, eccentricity
  • Pupil: border detection, diameter and decentration
  • Zones and grids: 3,5 and 7 mm, orthogonal axis or millimeter grid
  • Maps: local curvature, axial curvature, wavefront opd or wfe refraction map with 3d insert
  • Move axis: position of the axis selectable as corneal vertex, pupil center or any other choice
  • Print: print screen with header of the institution, or personalized print templates
  • Special functions: profiles, difference, repeatability check, maps comparison, caliper, refraction calculator
  • Image acquisition and movies: enabled with tv camera mounted on a slit lamp and video capture board (not included)
  • On-line help: on-line multi-language help detailed for all functions
  • Contact lens: fluorescein pattern simulation of most of international contact lens manufacturers’ geometries tilting to simulate lid pressure lens displacement in any position. Eccentricity measured at 6 and 8 mm, over-refraction calculator. Personalized auto-fit for customized lens adjustable clearance scale.
  • Link to third party software.
  • Internet connection: maps can be sent as attachments to e-mail messages
  • Local network and database: management of one or more independent databases shareable in a network



Options


  • Far mires cone: for deep set eyes. 28 mires are 3mm more recessed than standard cone. Coverage 75-80% of cornea
  • Keratron bridge: upgrades keratron using internal fgb, in order to use usb connection and updated scout software


Regulatory


  • Ce mark: directive 93/42/cee


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