MultiSpot ABERROSCOPES 

 

   
 
 


 

The “Multispot” family of aberroscopes is intended for automatic measurement of the overall aberrations of the human eye. The device contains a scanning IR laser system providing high accuracy of measurements and absolute safety of the procedure for the patient. Fast sampling (from 12 to 60 ms per measurement) and significant length of measurement series (up to 600 frames) permit allocating statistically significant aberrations. The device can be used for adaptive selection of glasses and contact lenses, for objective data accumulation for refractive surgery, as well as for other clinical studies.

             
     

 Applications

 
         
     

• Refractometry
• Refractive surgery
• Contact lens prescription
• Glasses prescription

• Accomodation study
• Retinal acuity measurement
• Dynamic aberrometry
• Tear film examination

 
         
     

Characteristics

 
         
     

The "Multispot" family of aberroscopes is intended for automatic measurement of the overall aberrations of the human eye. The measurements are made by means of a Shack-Hartman wavefront sensor comprising a unique "scanning source" technique. The system contains refraction and astigmatism compensators that expand the measurement limits and permit modifying the device to perform accommodation and visual acuity measurements.

Precise and easier (in comparison with other aberroscopes) positioning of the patient's eye is achieved by means of special IR markers that permit accurately detecting the pupil position by a digital camera.

Fast sampling (from 12 to 60 ms per measurement) and significant length of measurement series (up to 600 frames) permit allocating statistically significant aberrations.

The software permits submitting the measurement data of in the form convenient for everyday use in clinical purposes as well as for laboratory investigations. The SQL-compatible database provides great opportunities for processing the data obtained.

The data analysis tools include an option of importing corneal topograms obtained with devices of various types.

Various optional capabilities, such as visual acuity and accommodation volume determination, are possible.

 
         
     

TECHNICAL SPECIFICATION

 
         
     

Wavefront sensor:

Type

Number of microlenses

MultiSpot-250:
MultiSpot-250-HS:
MultiSpot-1000:

 

Shack-Hartmann

 

250
250
1000

Refraction compensator
(automatically or manually)

from -14 up to +16 D

Astigmatism compensator
(automatically or manually)

from -5 up to +5 D

Refraction measurement range

from -16 up to  +20 D

Astigmatism measurement range

from -7 up to  +7 D

Measurement accuracy

0.1 D

Input pupil location

43 mm ahead of the front cover

Input pupil diameter

up to 8 mm

Reference source

Laser diode, 785 nm, <100 μW, mechanical scanner

Single measurement time

MultiSpot-250:
MultiSpot-250-HS:
MultiSpot-1000:

 

30 msec
12 msec
60 msec

Up to 600 frames in one series with possibility of statistical processing

Alignment procedure

CCD-camera centered with respect to the visual axis

IR markers projected onto the iris to set the working distance.

Software

 Windows 2000/XP/Vista/7/8 (32/64-bit)

Output data

• Aberrations (up to 36 Zernike polynomials)
• Wavefront map
• Optical power map
• Error map
• Spot displacement map
(raw data)
• Image from the Shack-Hartmann Sensor

Power supply

120/240 V; 50/60 Hz

Input power

< 30 W

Size

 400΄500΄470 mm

Weight

 17 kg

 
         
       

SOFTWARE

 
           
 

   

The MultiSpot software consists of two main windows: Measurement Window and Report Window.

• MEASUREMENT WINDOW is divided into 4 parts:

1. Hartmannogramm · Shows the raw image from the Shack-Hartman sensor and is used for controlling the device position.

2. Pupil · Is used for alignment purposes. The green circle shows the pupil location determined from the hartmannogramm.

3. Control Panel · Permits inputting patients' data, running and stopping the procedure, controlling the measurement process and compensators operation.

4. WaveFront · Shows in real time the wavefront of the laser radiation outgoing from the patient's eye. Is used to control the measurement procedure and compensators operation.

 

• In the REPORT WINDOW, In the Report Window, series of up to 600 successive measurements can be analyzed. The user can average the series data, manually excluding undesirable events, such as winking, tears, etc.

The information is displayed both graphically and digitally.

Wavefront map, optical power, point spread function (PSF), and wavefront measurement error are displayed graphically. In addition, patient's visual acuity can be estimated using the data measured.

The Zernike polynomial coefficients are presented in microns. 36 Zernike polynomials are taken into consideration. The user can choose the desired number of aberrations to display, using a radio button.

In the patients' data window, the following information is displayed:

Patient # - patients' ID
Eye - left or right eye (OS or OD)
Frame time (sec) - measurement time from the start of the procedure
Sphere (diop) - refraction
Cylinder (diop) - cylinder
Axis (deg) - cylinder axis
PV (mcm) - wavefront PV (peak-to-valley) error
RMS (mcm) - wavefront root-mean-square error
Pupil Diameter (mm) - the input pupil diameter
Comment - the operators' comments

 
           
       

ACCESSORIES

 
           
     

The set of optical simulators of the human eye, produced from a high-quality optical glass, is intended for calibration of various ophthalmologic instruments, including aberroscopes (the set comes along with the MultiSpot), autorefractors, and keratometers. The reflectance of the artificial eyes' back surface for the near IR range corresponds to that of the human retina. The optical power of the eye can vary within the 20 D range, zero corresponding to the "ideal" eye focused at infinity.

       

Material

Optical glass

Optical power

-20...+20 D

"Cornea" curvature radius

7...9 mm

"Pupil" diameter

8 mm

"Retina" reflectance

10 %
(for the 780 nm wavelength)

           
       

PATENTS

 
           
 

   

• A patent for the utility model "Aberrometer with visual acuity testing system" was granted by German Patent and Trade Mark Office (30.08.2007, Patent holder - Visionica Ltd.).

• On May, 6th, 2009 the Federal Service on Surveillance in Healthcare and Social Development of Russian Federation permits production, sales, and clinical practice of the human eye aberroscope "MultiSpot-1000" in Russian Federation.

 
         
     

ALL PRODUCTS

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ShaH-IOL Intraocular lens Tester

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