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Keratograph® 4

Gold standard corneal topography – that’s what the Keratograph® 4 is all about.

  • Highlights
  • Functions
  • Software
  • FAQs
  • Technical Data
  • Service
  • Contact

A picture is worth a thousand words

Gold standard corneal topography – that’s what the Keratograph® 4 is all about.
It ensures reliability when it comes to taking measurements, providing consultation and fitting contact lenses. The Keratograph® accurate findings are something you can count on.

The integrated keratometer and automatic measurement activation guarantee perfect reproducibility.

In this way the Keratograph® 4 also meets highest clinical standards for such procedures as tear film assessment and qualitative cornea analysis. It stands out by virtue of its versatility.

The keratometer: integrated in all OCULUS topography devices

The benefits of the integrated keratometer are crucial for opticians’ and optometrists’ everyday practice:

  • measurements of actual corneal curvature
  • exact measurements for perfect correction of contact lenses
  • intuitive and simple to use
  • can be processed quickly
  • high-resolution images ensure clear results for customers
OCULUS Keratograph 4

Highlights

A picture is worth a thousand words

Use the Keratograph® 4 as a marketing tool and incorporate it actively into your consultations. With the Keratograph® 4 software you can show images which your clients/patients have never seen before.

Contact Lens Fitting and Fluorescein Image Simulation

Contact lenses are recommended on an individual basis and displayed in a list. In order to avoid taking more steps than necessary when fitting contact lenses, the fluorescein image can be simulated beforehand.

The contact lens can be rotated and moved around. Fluorescein image simulation is adjusted automatically. The integrated and expandable database contains all customary types of contact lenses and is updated on a regular basis. The user can determine the order in which contact lens manufacturers appear.

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OxiMap® – Visualizing the Oxygen Transmissibility

Professional patient consultation
The cornea needs oxygen and a good oxygen supply is fundamental for the comfort of a contact lens wearer. New materials used for soft contact lenses offer excellent oxygen transmissibility.

This can be shown with the new OCULUS OxiMap® display. You can easily show these color maps to your patients and help them choose better contact lenses.

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TF-Scan Illuminates the Condition of the Tear Film

Use this software to show patients the quality and quantity of their tear film through non-invasive measurements of the tear film breakup time as well as the tear film amount. Improve their understanding and trust in your assessment of their dry eye diagnosis.

Software

The heart of the Keratograph® 4

TF-Scan Makes the Tear Film Visible
Tear Film Quality (NIKBUT)
Tear Film Quantity (tear meniscus)
Different Ways of Determining Pupil Reaction:
Using the “Pupillometry” option
Optional Imaging-Software*
Essential for:
How Much Oxygen Really Reaches the Cornea?
Plain and Comprehensive Visualization Assures Patient Loyalty!
Compare Different Soft Contact Lenses!
Patient consultation made easy. This software shows the quality and quantity of the tear film.
In cases of dry eye patients and contact lens wearers, the tear film should be examined carefully. Only an intact tear film guarantees contact lens wearing comfort! The Keratograph® 4 measures the tear film breakup time non-invasively (quality assessment). You can show your patient the individual tear film quality using the color maps. In addition, you can take another non-invasive measurement to determine the amount of tear film (tear film quantity).
The OCULUS Keratograph® 4 determines the break-up time using the NIKBUT procedure (non-invasive-Keratograph-break-up time).
In addition, you can take another non-invasive measurement to determine the amount of tear film (tear film quantity).

  • Examination of the pupil reaction both with and without glare
  • Examination using two different glare stimulus powers
  • Clear presentation of the results in graphic form: pupil changes over a period of time; minimum, maximum and mean pupil diameter, incl. standard deviation
  • Comparison views possible

The reaction of the pupil, can be checked with and without blinding. This builds the basis for selecting the proper treatment zone for laser controlled surface ablation, multifocal contact lenses or premium IOLs. The pupil reaction of the two eyes can be compared.
The Imaging-Software takes real-time fluo-images or fluo-clips of the contact lens. The high resolution clip shows the movements of the contact lens on the cornea. A side-by-side comparison displays the simulated fluo image of the software and the real time fluo image and the clip.

* Optional software for Keratograph® 2007 April model and upwards

  • Demonstration of the fit and mobility of contact lenses
  • Assessment of the static fluo-image
  • Assessment of the fit of the contact lenses with different pupil diameters
  • Side-by-side comparison of fluo-image simulations to real-time fluo-images
  • Choice of the final contact lense
  • Expertise and customer long term relationship

The OxiMap® presents a color map of the oxygen transmissibility of soft contact lenses based on the lens power, which is easy to understand – even for your customers!

Until now, only the oxygen transmissibility values for the center of a contact lens with -3.0 D were available. The OxiMap® shows the oxygen transmissibility depending on the lens material and the lens thickness. The OxiMap® is available for the most frequently sold spherical soft contact lenses. This impressive tool assists you in helping your patients select the most suitable contact lens.

Contact lenses act as a potential barrier to oxygen transport even when the eyes are open to the atmosphere. Long hours of wearing comfort can only be guaranteed with a sufficient oxygen supply. The color representation of the various terms of oxygen transmissibility is based on international recommendations for daily, extended and continuous wear.
The OxiMap® is individually adapted based on the lens power and supports you in your consultation with the patient and helps you to choose the most suitable contact lens. New materials used for soft contact lenses provide excellent oxygen transmissibility.

OxiMap® was developed in close cooperation with JENVIS Research and the University of Applied Sciences in Jena.

Device
TF-Scan Makes the Tear Film Visible Tear Film Quality (NIKBUT) Tear Film Quantity (tear meniscus) Different Ways of Determining Pupil Reaction: Using the “Pupillometry” option Optional Imaging-Software* Essential for: How Much Oxygen Really Reaches the Cornea? Plain and Comprehensive Visualization Assures Patient Loyalty! Compare Different Soft Contact Lenses!

Title

Description

FAQs

The NIKBUT measurement for dry eye with severe corneal epithelial damage is difficult. Even when the NIKBUT measurement is performed in such cases, the device mostly reports the results as “too short”.
The differences between fluorescein TFBUT and NIKBUT values should be noted, although positive correlation between TMH and Schirmer test values has been reported.
White areas are displayed if the patient blinks before 15 seconds after the measurement started. This does not affect the measurement in any way.
No, the software detects a basic image. In the case of keratoconus for example the strained Placido rings induced by the condition is noted initially by software and distortions from the original image is recorded and indicated as a break in the tear film. However, in cases with advanced keratoconus or severe irregular corneal astigmatism, it is hard to perform the measurement.
No, the area being analyzed during the NIKBUT measurement usually doesn’t coincide with the area affected by the nose shadow.
At least three measurement points (nasal and temporal limbus, pupil center) should be selected. To get the right value the ruler has to be placed on the lid margin and measure perpendicular up to the last reflex of the meniscus. Please see image as reference. The correct measurment is 0.22 mm for this example.

In eyes with small lid aperture or eyes with ptosis, (commonly seen in the older Asian population), the device cannot detect the conjunctival area correctly.
The particles are a combination of eroding corneal epithelial cells, tarsal conjunctival cells and small air-particles.
Yes, data from the NIKBUT, R-Scan and all keratometric data can be exported to csv files.
Yes, with the 22 Placido disc 22.000 real measured data points are generated after each measurement. None of these are extrapolated measurements.

Yes, a real keratometer is included in the hardware measuring simKs of the anterior surface.

No, the Keratograph is a Placido topographer. Placido discs are projected on the tear film, the software analyzes the resulting images and measurement data of the anterior cornea is generated. No, a Placido topographer can measure the posterior cornea on its own.

Topographic indices for keratoconus screening are incorporated in the software, as well as Fourier Analysis. Objective inspection of the sagittal map is another tool to aid with diagnosis.
No, lenses cannot be individually measured. Well-known soft lenses were analyzed and the information is programmed into the software. The role of the OxiMap® is to educate patient’s on the importance of using lenses with high oxygen transmissibility, showing them the benefits in an easy to understand image. Furthermore the OxiMap® gives information about the oxygen transmissibility over the entire surface of the lens, as well as differences between prescriptions.

Specifications

Technical Data

Measuring range 0.1 – 1.5 in, 9 – 99 D
Accuracy ± 0.1 D
Reproducibility ± 0.1 D
Number of rings 22
Working distance 80 mm
Number of measuring points 22,000
Camera digital CCD camera
Source of illumination placido illumination: red 650 nm
imaging illumination: blue 465 nm (UV-free)
pupillometer illumination: infrared 880 nm
Dimensions (W x D x H) 10.8 x 12.6 to 15.7 x 19.3 to 20.4 in
Weight (Measuring head) 5.1 lbs
Weight (with base) 11.7 lbs
Power Consumption max. 30 W
Voltage 100 – 240 V AC
Frequency 50 – 60 Hz
Minimum PC requirements Intel® Core™ i5, 1 TB HDD, 8 GB RAM, Windows® 7 – Windows® 10
Recommended screen resolution 1920 x 1200 pixel

Keratograph® 4 Whitepapers & Publications

Online Seminars
Learn from the experts

[oculus-akademie-events search="Keratograph,augenärzte/med.fachpersonal,augenoptiker/optometristen"]

Download whitepapers about the Keratograph® 4.

DICOM Conformance Statement for Keratograph®, 2.3.14

Date: 03/01/2013
Language: English

DICOM Conformance Statement for Keratograph® 4, 1.76

Date: 10/04/2011
Language: English

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Verbrauchsmaterial & Ersatzteile

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Questions?
Get in touch with us.

Tel. +1 888 284-8004

Choose your topographer

OCULUS gives you the choice. What do you need for topography in your everyday practice?
Keratograph® 5M, Keratograph® 4 or Easygraph: Whichever device you choose, OCULUS quality is assured.

OCULUS Keratograph® 5M
OCULUS Keratograph 4
OCULUS Easygraph
Keratograph® 5M Keratograph® 4 Easygraph
Topography
Overview Presentation
Large Color Map
4 Color Maps Selectable
Camera Image
3D Cornea
Fourier Analysis and Zernike Analysis
Topographic Keratoconus Screening
Elevation Map
Corneal asphericity
Lens Fitting
Compare examinations
Measurement contact lens back surface
Imaging
Image and video documentation with fluo images
Near-Portion Height Measurement
Palpebral Angle Measurement
Manual Recording Mode
Crystal TEAR Report
Crystal TEAR Report (Find out the cause of dry eye disease quickly and reliably)
TF-Scan (Evaluation of lipid layer and tear film dynamics, measurement of tear meniscus height and non-invasive tear film break-up time (NIKBUT))
R-Scan (Automatic classification of bulbar and limbal redness)
Meibo-Scan (Meibography of upper and lower eyelid)
Pupillometry
Examination of pupillary response using the pupillometer, asymmetry test and manual measuring mode
Oximap®
Raphic representation of the oxygen transmissibility (Dk/t) of soft contact lenses
Technical Data
Measuring range 0.1 – 1.5 in, 9 – 99 D 0.1 – 1.5 in, 9 – 99 D 0.1 – 1.5 in, 9 – 99 D
Accuracy ± 0.1 D ± 0.1 D ± 0.1 D
Reproducibility ± 0.1 D ± 0.1 D ± 0.1 D
Number of rings 22 22 22
Working distance 78 bis 100 mm 80 mm 40 mm
Number of evaluated data points 22,000 22,000 22,000
Camera Digital CCD camera Digital CCD camera
Dimensions (W x D x H) 275 x 320 to 400 x 480 to 510 mm
(10.8 x 12.6 to 15.7 x 18.9 to 20.2 in)
275 x 320 to 400 x 490 to 517 mm
(10.8 x 12.6 to 15.7 x 19.3 to 20.4 in)
119 x 102 x 216 mm
(4.7 x 4.0 x 8.5 in)
Weight 7.1 lbs (Measuring head) / 13.5 lbs (with base) 5.1 lbs (Measuring head) / 11.7 lbs (with base) 1.6 lbs
Details Details

Legend: ✓ = available * – = not available *  ⃘  = optionally available against surcharge