Review of e-see Portable Auto Refractor - Eye Health Nepal

Review of e-see Portable Auto Refractor

Review of e-see Portable Auto Refractor: 
Review Author: Mr. Kiran Subedi

e-see is a special version of QuickSee™ Portable Auto Refractor developed by PlenOptika. For SAARC Region Aurolab (an integral part of the Aravind Eye Care System) and PlenOptika, with financial support from the Indo-US Science & Technology Endowment Fund, Seeing Is Believing (a program of the International Agency for the Prevention of Blindness), and other public and private sources, collaborated to manufacture it in India and makes clinical-quality vision care possible for everyone in the region, regardless of their financial or geographic limitations.

Aurolab esee Autorefractor

e-see vs QuickSee 


Similarities:



  • The design of both autorefractor is similar.  
  • Both of the autorefractor claim that Clinical accuracy in a handheld device, Powered by the PlenOptika Wavefront Refraction Engine. 
  • Both of the autorefractor have similar features, Wavefront aberrometry
  • Both of these autorefractor gives results in 10 seconds. 



e-see portable autorefractor



Quick See Autorefractor


Difference


  • QuickSee have binocular sensors so you can take measurement of both eyes at the same time (minimum 10 sec), while e-see only have a monocular sensor so you can only measure one eye at the time and you have to rotate the auto refractometer to examine another eye (Result time 10+10 sec = 20 sec). 

Specifications of e-see:

  • Contact lens wearers: Over-refraction compatible
  • Dilation requirement: None
  • Illumination Requirements: Works in any illumination
  • Laser Safety: Class I
  • Interfaces: Bluetooth
  • Battery Specifications: 6-8 Hours of Operation; 6 Hours charge time
  • (8 hours for an initial charge)
  • Time per Measurement: 10 seconds per eye

Advantages of e-see  autorefractor: 
  • Portable & Light Weight
The e-see autorefractor is portable, which means easy to carry from one place to another place. As we are using this e-see for more than a year, we feel more comfortable to use this machine in outreach programs, such as school screening camps and other Diagnostic Screening and Treatment (DST) camps. It comes with having an external Bluetooth thermal printer, so you can print the results at the time. The weight of this device is 1 Kg. The size is 11*6.5*3.25 in

  • Can be used in both indoors and outdoors
If you don't have an indoor semi-dark room then you don't need to worry, you can use this e-see device in any environment. 


  • Rechargeable battery
This e-see device has inbuilt rechargeable battery, The company claims battery working time is 6-8 Hours of Operation; 6 Hours charge time (8 hours for initial charge), but as per our experience it doesn't work for 6 hours if you have a large number of patients and used continuously it will work around 3-4 hours. If you are planning to conduct camps in the remote area where is the lacking of electricity supply, you can charge this device by using power banks also. The original adapter of e-see comes with an output voltage of 5V: 2.4A, If you have genuine power banks most of their output power will be around 5V: 2.1 A. The e-see has a Micro USB charging point and your mobile charger cable will also work for it. 


  • Wavefront aberrometry
Wavefront aberrometry is an advanced technique used in ophthalmology to measure how light through passes through the cornea and the crystalline lens, the refractive (light focusing) components of the eye. Distortions to the wavefront of light that occur as the wavefront of light travels through the eye are called aberrations, representing specific vision errors, and are captured with specialized optics called a Shack-Hartmann wavefront sensor. These specialized optical components are not typically found in traditional desktop autorefractors.

In the clinic, wavefront aberrometry technology can be used to precisely measure lower-order aberrations objectively ("autorefraction"), often with more accuracy with respect to subjective refraction than a traditional desktop autorefractor. Low-order aberrations can be corrected by spherical and cylindrical eyeglass lenses for nearsightedness, farsightedness, and astigmatism.


  • Best Accuracy
The manufacturers claim accuracy about <= 0.25 D: 60-70% of patients<= 0.5 D: 80-90% of patients (see publications), but as per my experience, it has very good accuracy if you used it properly and if your patient feels comfortable with it. All refractometer needs subjective refinement of power strength and axis. Prescribing purely from the autorefractor prescription is unfeasible in practice.  

  • Get your patients details at android SmartPhone
They have e-see Companion App, which works on Android devices and can be used to transfer patient logs as well as perform firmware updates to the e-see. The e-see will autosave all refraction records on devices. 


Disadvantages of e-see autorefractor: 

  • Limited Power Range
It only shows result in spherical between -10.00 DS to +10.00 DS and in cylindrical between -6.00 Dc to +6.00 Dc. If your patient is high myopic, or high hyperopic then you can't able to get results by using this device. 

  • Not Suitable for High Volume Patient flow 
It is rechargeable and if you have a high volume of patients, you can't use it at the same time of charging, like other refractometers that work with direct electricity. You have to take breaks for charging. 

Photo Source: Dr Shyam Vyas
  • No Keratometry Reading 
We all know that e-see is only the refractometer. Nowadays many auto kerato-refractometer are available in markets, which shows you both Keratometry reading and refraction reading at the same time. For Contact Lens practitioners this device will not help for the curvature reading. 
  • Need more practice to use as compared to other fixed auto refractometers
It needs more practice to use this device at first. You have to align the devices properly (no tilt), maintain the patient's focus at any distance object, and IPD adjustment before starting the test. So, some of the practitioners don't feel comfortable with this refractometer as compared to the other fixed auto refractometer. But if you practice more you can have both eyes refraction results within a minutes. 



The Price of e-see portable autorefractor: 

The price of e-see portable autorefractor in Nepal is around 5 Lakh (NPR 500,000), as I get price information from Aurolab's authorized distributors for Nepal (Sweekriti International Pvt. Ltd). In India I don't know the exact price for it, if you know please mention the price on the comment box below.

In the International market, Quick See which has Binocular sensors mentioned the price of  USD $6,490.00  on plenoptika's shop https://shop.plenoptika.com/products/quicksee.

Please don't forgot to give your valuable comment in the comment box below.

References:
http://eseeautoref.com/service.html
https://plenoptika.com/


Disclaimers: 

All views expressed in this article are authors own, do not have any financial, non-financial interest with the company/manufacturers and do not represent the opinion of any entity/organization in which the author is involving now. Photos on the above articles were taken from various websites by Eye Health Nepal to make the content clearly understandable. If anyone/organization has copyright issues please email to [email protected], we will remove this from our blog.