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Page 32

Instruction Manual Easygraph

Z 4,

4 four-lobed defect

Z 3,

3 trefoil

Z 2,

astigmatism

2 fourth-order astigmatism

Z 1,

tilt

1 coma

Z 2,0 focus

Z 4,0 spherical aberration

degree n

angular
frequency
m

Overview of the most important

Zernike polynomials

Содержание Easygraph 70620

Страница 1: ...Copyright by G 70620 0906 e Easygraph 70620 Instruction Manual Measurement and Evaluation System for Corneal Topography...

Страница 2: ...ddle sized company whose only focus is to support physicians and optometrists in their demanding work with a line of top quality products for ocular examinations and operations The Easygraph before yo...

Страница 3: ...4 5 Patient Data 17 7 4 5 1 Rename Patient 17 7 4 5 2 Deleting Patient Data 17 7 4 5 3 Exporting Patient Data 17 7 4 5 4 Importing Patient Data 18 7 4 6 Backup Copies of Data 19 7 4 6 1 Backing Up Dat...

Страница 4: ...s Button System 63 7 5 4 2 Contact Lens Database 54 7 5 4 3 Input New Contact Lens Types Lens geometry 65 7 5 4 3 1 Creating Contact Lens Geometries Rigid 66 7 5 4 3 2 Creating Soft Lens Geometries 68...

Страница 5: ...072 Dust cover 70620 00 004 Reference globe 70500 05 000 Holder for slitlamp 70620 00 010 CD with Easygraph Software 70620 00 005 User manual G 70620 ed Easygraph parking unit 70620 00 006 for table t...

Страница 6: ...ible to connect them check whether the plug is correct for the socket If you find damage in either a plug or a socket have them repaired by our service personnel To disconnect electric plugs from thei...

Страница 7: ...by persons who have been instructed in its use and whose professional training knowledge and practical experience ensure that they will work with the unit appropriately The OCULUS Easygraph has been...

Страница 8: ...ad these operating instructions carefully Being an optical device this unit must be handled with care Do not expose it to any vibration impacts contamination and high temperatures 6 3 Components of th...

Страница 9: ...also be mounted on an optionally available guide rail The Easygraph can be pushed with this into a rest position so that examinations can then be made with the slitlamp However note that the guide ra...

Страница 10: ...rled sleeve back first of all Plug the plug in power supply unit into the wall outlet only on conclusion When separating the plug connections first separate the power supply from the Easygraph at the...

Страница 11: ...the entry Search removable media floppy CD ROM and activate the entry Include this location in the search Please chose as a path X driver in which you substitute X with the capital letter of your CD...

Страница 12: ...ble media floppy CD ROM and activate the entry Include this location in the search Please chose as a path X driver in which you substitute X with the capital letter of your CD ROM drive Please insert...

Страница 13: ...Start the Device Manager by clicking Start Settings Control Panel System Hardware Device Manager Extend the section Universal Serial Bus controllers and click with the right mouse button USB Root Hub...

Страница 14: ...ector position separately see chapter on reference measurement page 71 Turn the reflector corresponding to the following pictures into the correct position This position is detected automatically by t...

Страница 15: ...ect a patient name or enter a new patient name in the data management system The following screen display is used for this purpose 7 4 1 Selection of a Patient All previously examined patients are lis...

Страница 16: ...des that an examination is clicked on in the examination window this is loaded in the examination program automatically By double clicking on a patient s name the examination program is also started F...

Страница 17: ...n puts the changes into effect 7 4 5 2 Deleting Patient Data Patient data can be deleted with the screen button Delete Pat Caution Double confirmation is required before the data are actually deleted...

Страница 18: ...torage medium which will receive it The data set is transferred by activating the Export screen button whereas Cancel terminates the function without a transfer of data 7 4 5 4 Importing Patient Data...

Страница 19: ...est to use this function when the PC and the Easygraph will not be needed for a while Activate Save in order to start the data backup 7 4 6 2 Data Restoration The restoration of already stored data ca...

Страница 20: ...ording to either patient names or ID numbers If you plan to use names to find patients it is helpful to sort the list by names If you plan to use ID numbers to call patient data to the screen the sort...

Страница 21: ...ifferent program functions can be selected from this menu Print Prints out the screen contents of the moment at the printer 7 5 1 How to Carry Out a Measurement Adjust the height of the table so that...

Страница 22: ...an be forced by pressing the RETURN key on the PC keyboard After measurement has been activated the image is transferred in digital form to the PC and displayed Then the processing of the image begins...

Страница 23: ...curvature profile of the measured cornea Here too the pupil edge is presented as a black and white line Color Bar At the right margin of the overview display is a list of the radii of curvature to wh...

Страница 24: ...orresponds to the parameters in the color bar mm D Sag Tan Rel Abs Field for Comments At the top edge of the camera image is a place for adding comments For this purpose click on the top edge of the c...

Страница 25: ...int lies Color The color which is allocated to the curvature If two marked areas are present the difference between the two points is shown at lower left Difference between radii of curvature in mm Re...

Страница 26: ...s the viewer sees a true 3 dimensional view of the display Realistic The actual geometric form of the corneal surface is displayed if the slide bar Exaggerate is moved completely to the left what mean...

Страница 27: ...ponents of all rings are regrouped and displayed in separate images showing respectively zero order first order second order components etc Some interesting characteristics are found when the individu...

Страница 28: ...e values In a normal cornea the arithmetic mean of all irregularities is less than 0 030 mm for sagittal curvature 0 141 for tangential curvature An inverse relationship obtains between the degree of...

Страница 29: ...used The original color bar left is only used in the Original and the Spherical equivalent maps The Decentration Regular astigmatism and Irregularities maps can only be represented using the relative...

Страница 30: ...matism Whereas in astigmatism the axis runs in a straight line in keratoconus it not infrequently undergoes a rotation from the center to the periphery thus taking on a spiral appearance Irregularitie...

Страница 31: ...eeded in mathematically representing the deviations of a real wavefront from an ideal one by means of a sum of polynomials Each polynomial is named according to the image defects it represents e g ast...

Страница 32: ...raph Z 4 4 four lobed defect Z 3 3 trefoil Z 2 2 astigmatism Z 4 2 fourth order astigmatism Z 1 1 tilt Z 3 1 coma Z 2 0 focus Z 4 0 spherical aberration degree n angular frequency m Overview of the mo...

Страница 33: ...ividual polynomials have on the image By clicking the Scale button the image may be displayed in a scale optimal for it In addition the scale may be manually adjusted using the Exaggerate slider contr...

Страница 34: ...rameters Clicking the Change button opens a menu for changing the Zernike fit parameters Click Calculate new to confirm the new settings and perform a recalculation The current settings i e the Zernik...

Страница 35: ...icture The height of this point Max is shown along with its position X Pos and Y Pos This height value quantifies the degree of a keratoconus The more the keratoconus progresses the bigger is gets thi...

Страница 36: ...es the following data for index calculation curvature data height data and Fourier analysis as well as Zernike analysis output This comprehensive use of all relevant corneal data permits early identif...

Страница 37: ...the degree of aberration KKS Keratokonus Stage Based on topometric measurements this index follows the clinical findings of Amsler s classical staging schema AA Analyzed Area Gives the area of the co...

Страница 38: ...y also show the attribute possible in cases of suspected incipient keratoconus The present classification has been adapted as far as possible to Amsler s and Muckenhirn s stages Note However one shoul...

Страница 39: ...epict the development and different degrees of severity of keratokonus In normal and astigmatic eyes as well as in near central keratoconus this display mode yields perfectly closed rings In the trans...

Страница 40: ...ady been taken into account Focal distances are always given in terms of diopters The difference between this and the conventional curvature display method becomes apparent when one considers the topo...

Страница 41: ...e changing spectacle power values of an earlier examination i e when the examination date differs from the current date the system asks Change the stored spectacle power values to prevent inadvertent...

Страница 42: ...keratoconus quantification Height data make it possible to determine how of the cornea would theoretically have to be removed in order to produce the desired reference surface from cornea as original...

Страница 43: ...ms of differences in height between the measuring point cornea and the reference body The figures at the bottom left give the simulated ophthalmometric values including axis position and mean eccentri...

Страница 44: ...n sagittal radii The hour glass shape in the center is an artifact inherent to the display method In the right eye the apex appears to be located inferior and nasal while in the left eye it appears to...

Страница 45: ...ears enlarged in the bottom right hand corner of the display Use the right mouse button to deactivate the magnifying function 7 5 2 10 Refractive Compare The comparative representation serves to depic...

Страница 46: ...in its center This value gives the average refractive difference for the entire zone rather than of a single point Color bar the color bar on the left of the refractive difference map gives a color s...

Страница 47: ...tion can now be called to the screen The selection is made according to date clock hour and right or left eye It is possible to calculate a differential diagram of two images as a means of determining...

Страница 48: ...e center Astigm Corneal astigmatism in the center Axis Axis position of the flat meriadian Cor Diameter of the iris or the cornea Ecc Mean eccentricity of the cornea Fix dif Fixation difference Distan...

Страница 49: ...always produces the next possible value e g diameter 9 20 9 60 After a change of lens type in the Lens or Manufacturer field the best possible suggestion for that lens type is first displayed To enter...

Страница 50: ...results in different shades of green The meaning of the various shades can be inferred from the green color bar Above the fluo image is a description of the contact lens used for the simulation After...

Страница 51: ...e bottom To delete a fluo image click on it with the right mouse button Answering the subsequent question Delete Fluo icon with Delete removes the fluo icon and causes the icons below to move one up 7...

Страница 52: ...sified as pertaining either to the Basis curve or the Periphery Changing parameters of the periphery only makes sense if the Manufacturer field has been set to Mathematic because the peripheral geomet...

Страница 53: ...urves involving large distances i e in cases of poor lens fit Changes of scale are automatically followed by a recalculation of the fluo image 7 5 3 2 5 Top Test The Display field in the Contact lens...

Страница 54: ...The OCULUS software will then run another fluo image simulation Closing the window directly circumvents a renewed calculation of the fluo image Note To change the geometric data of a Hecht lens you al...

Страница 55: ...ign The spectacle power value is converted into corneal vertex power on the basis of the corneal vertex distance CVD and displayed in the column CVD 0 If power values have already been entered these w...

Страница 56: ...is field shows the Expected remaining power described above Clicking the Back button exits the power calculation module and transfers the new values to the Power calculation field of the contact lens...

Страница 57: ...duced astigmatism neutralized by the shape of its anterior surface this type of contact lens corrects corneal astigmatism as a spherical contact lens does while at the same time offering the advantage...

Страница 58: ...nd Loading the Fitted Contact Lens After fitting the contact lens click the Quit button to end the fitting routine cf Figure at page 49 The program then asks whether or not you want it to store the se...

Страница 59: ...lens and there is consequently no blue highlighting of contact lenses in the suggestion list The fluo image is not stored along with the other data and should therefore first be calculated by clickin...

Страница 60: ...r scale The scale can be absolute or relative When the scale is absolute each radius of curvature always has the same color A relative color scale is automatically scaled the center of the scale corre...

Страница 61: ...D image diagrams of the Overview Display Fourier analysis etc It does not refer to keratometric data color presentations of refraction height data contact lens fitting Presentation Here you can choose...

Страница 62: ...munication The type of interface can be chosen between serial and USB Presently the Easygraph supports the USB interface only With the switch System the details of the chosen type of interface can be...

Страница 63: ...d the interface Mode The Easygraph only responds if the Online mode has been selected Setting the mode to Demo mode permits you to use the software without the Easygraph Interface The USB communicatio...

Страница 64: ...commendations If the geometric data are similar then the contact lenses of the manufacturer who is higher in the list are preferable Note To create a list with your own priorities first deactivate all...

Страница 65: ...viations must also be entered Abbreviations are used in the list of recommendations for contact lens fitting because only limited space is available here Once all designations have been entered the ne...

Страница 66: ...be created by entering the geometric data of the contact lens series with minimum maximum values and increments The following data must be defined 1 Base curve parameters r0 Central radius of contact...

Страница 67: ...d B can be entered after this formula has been clicked For example the user can define the curvature of a marginal zone as being invariably 0 8 mm greater than the central radius A 1 B 0 8 or invariab...

Страница 68: ...constant dr2 0 If the Generate new lenses button is clicked the previously defined series of contact lens data is created and the function is ended More than one series can be created for a single le...

Страница 69: ...Then the Export button must be clicked The contact lens data are then copied to the diskette The following question appears if one or more contact lens types are already stored on the diskette The fo...

Страница 70: ...ed out immediately However changes in the PC database become effective only after the Save Quit button is activated No changes are carried out in the PC database if the Cancel button is clicked Update...

Страница 71: ...n the immobilization arm on the combination chin and forehead rest Carry out a measurement using the reference globe cf 7 5 1 page 21 Activate the function Save Reference Table in the Miscellaneous me...

Страница 72: ...Problem The PC shows the following message after the examination software is started No communication with Easygraph Please check whether the Easygraph is connected to the power supply and to the USB...

Страница 73: ...elf responsible for the safety reliability and serviceability of the unit only if the unit is used in accordance with this Instruction Manual The unit contains no parts which require maintenance or re...

Страница 74: ...ta Easygraph Measurement range 3 to 38 mm 9 to 99 D Accuracy 0 1 D Reproducibility 0 1 D Number of Rings 22 Working distance 40 mm Evaluated data points 22 000 Ma e HxWxD 214x116x103 mm Weight 0 63 kg...

Страница 75: ...Z prakt Augenheilkd 20 61 64 1999 Kontaktlinsenanpassung VideoEasygraphie Prof Dr Bernd Lingelbach 15 Z prakt Augenheilkd 20 157 164 1999 Zernike Polynome Prof Dr Bernd Lingelbach 16 Kontaktlinsen Ve...

Страница 76: ...Contact Lens Bitoric Compensated 57 Contact Lens Export 69 Contact Lens Generate New 68 Contact Lens Import 69 Contact Lens Rotating 51 Contact Lens Shifting 51 Contact Lens Soft 49 Contact Lens Toric...

Страница 77: ...Pointer 24 Measurement Force 22 Measurement Release 22 Millimeter 60 Minimum PC requirements 74 Move Examination 17 N n Refraction Index 56 Name Rename 17 New Measurement 21 New Patient 16 O Operatio...

Страница 78: ...0 Software version 62 Sorting Patient Data 20 spectacle power 41 Spectacle Power 55 spher eccentricity 29 spherical aberration 31 spherical equivalent 27 standard deviation 37 Start Examination Progra...

Страница 79: ...evices are designed for use in the electromagnetic environment described below The user of Oculus Devices is to ensure that it is used in such an environment Measurement of emissions Compatibility Ele...

Страница 80: ...The quality of the power supply voltage should be equal to that of a typical business or hospital environment Voltage dips brief power outages and fluctuations in power supply voltage acc to IEC 61000...

Страница 81: ...isturbances are possible in the vicinity of equipment bearing the following symbol NOTE 1 NOTE 2 The higher frequency range applies at 80 Hz and 800 MHz These guidelines may not be applicable in all c...

Страница 82: ...r frequency in m Nominal capacity of the transmitter W 150 kHz to 80 MHz d 1 2 P 80 MHz to 800 MHz d 1 2 P 800 MHz to 2 5 GHz d 2 3 P 0 01 0 12 0 12 0 23 0 1 0 38 0 38 0 73 1 1 2 1 2 2 3 10 3 80 3 80...

Страница 83: ...isions of the Directive 93 42 EEC which apply to him addempie a tutte le exigenze della Direttiva 93 42 CEE che lo riguardano reuna todos los requisitos de la norma 93 42 CEE Einstufung Richtlinie 93...

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