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   Table of Contents      
LETTER TO THE EDITOR
Year : 2021  |  Volume : 69  |  Issue : 2  |  Page : 468-469

Periodic troubleshooting of LENSTAR® encoder disc's motor for preventing surprise dust induced crashes


1 Medical Officer, Department of Glaucoma and Research, Mahathma Eye Hospital Private Limited, Trichy, Tamil Nadu, India
2 Medical Officer, Department of Cataract and Refractive Surgery, Medical Officer and Head, Trichy, Tamil Nadu, India
3 Department of Cataract and Refractive Surgery, Mahathma Eye Hospital Private Limited, Trichy, Tamil Nadu, India
4 Chief Medical Officer, Mahathma Eye Hospital Private Limited, Trichy, Tamil Nadu, India

Date of Web Publication18-Jan-2021

Correspondence Address:
Dr. Prasanna V Ramesh
Mahathma Eye Hospital Private Limited, No.6, Seshapuram, Thennur, Trichy - 620017, Tamil Nadu
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ijo.IJO_2791_20

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How to cite this article:
Ramesh PV, Ramesh SV, Ramesh MK, Rajasekaran R. Periodic troubleshooting of LENSTAR® encoder disc's motor for preventing surprise dust induced crashes. Indian J Ophthalmol 2021;69:468-9

How to cite this URL:
Ramesh PV, Ramesh SV, Ramesh MK, Rajasekaran R. Periodic troubleshooting of LENSTAR® encoder disc's motor for preventing surprise dust induced crashes. Indian J Ophthalmol [serial online] 2021 [cited 2022 Sep 27];69:468-9. Available from: https://www.ijo.in/text.asp?2021/69/2/468/306985



Dear Editor,

Optical biometers like LENSTAR (Haag Streit, USA) is an integral part of the daily life of an ophthalmologist considering its pivotal role in the preoperative workup of cataract patients. Sudden crashes of such vital instruments create an unexpected inconvenience in our patient care.

The motor of the encoder's disc present inside the LENSTAR® (Haag Streit, USA) powers the super-luminescent diode laser of 820 nm for the smooth functioning of LENSTAR®. The ideal conditions for motor stability are a temperature of +15°C to +40°C, air pressure of 700 hPa to 1060 hPa, a relative humidity of 20% to 75%.[1] With due course of time, dust tends to get accumulated inside the motor of the encoders disc rendering it? unstable [Figure 1]b and [Figure 2]b by providing an unfavorable environment for its optimal functioning, causing the machine to crash. Though all biometry instruments are usually kept in air-conditioned chambers and not in the open, one would expect no dust to accumulate. However, dust can seem to appear out of the blue, sometimes even after we have just finished cleaning.[2]
Figure 1: (a). Program files of LENSTAR® showing encoder disc's motor stability which is >1ppm (red circle). (b). Motor of the encoder disc is sheathed with dust

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Figure 2: (a). Program files of LENSTAR® showing encoder disc's motor stability of 0.65 ppm (red circle) following cleanup. (b). Motor during cleaning process showing area of demarcation (red arrows) between clean and dusty region

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To prevent such surprises related to dust-induced LENSTAR® crashes the functionality of the motor should be periodically checked to apprehend the problem before it catches us off guard. This functionality can be verified in the program files console (Local disc D:-> Program Files (x86)->Haag Streit ->EyeSuite->EyeSuiteConsole.exe) of the LENSTAR [Figure 1]a and [Figure 2]a]. This simple awareness of the concept of encoder disc's motor stability; that its functional value should not rise above one ppm aids us in troubleshooting and avoiding a surprise LENSTAR crash which may hinder our routine biometry workup in the day to day practice.

Though fighting dust can feel like a never-ending battle, it's one worth fighting. Even if all sources of dust can be intercepted, periodically checking the encoder disc's motor stability in the console can prevent surprise crashes of the LENSTAR.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.



 
  References Top

1.
Haag Streit Academy. Available from: https://www.haag-streit.com/haag-streit-usa/products/haag-streit-diagnostics/lenstarbiometry.[Last accessed on 2020 Aug 8].  Back to cited text no. 1
    
2.
Where does dust come from Available from: https://molekule.science/where-doest-dust-come-from-source-house-solutions/.[Last accessed on 2020 Aug 27].  Back to cited text no. 2
    


    Figures

  [Figure 1], [Figure 2]



 

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