Validity of a Smart-Glasses-Based Step-Count Measure during Simulated Free-Living Conditions
Round 1
Reviewer 1 Report
The authors investigated the validity of their smart glasses, called Wellness glasses in step counting. They obtained the data from 26 healthy subjects while walking. For validation and comparative purposes, they obtained gold-standard measures from inertial sensors mounted at subjects’ ankles and reference data from commercial step counters, worn at waist and wrists. The results showed that the Wellness glasses detected steps with an overall percentage error of 1% revealing an accurate step counter with performances sometimes even higher than the more common step counter. Although the results clearly indicated the practicality of the Wellness glasses, the manuscript lacks the explanations about fabrication, construction, and operation of the device. How were the motion sensors, Bluetooth module, and batteries integrated into the glasses? What is the size and weight of the device? The manuscript requires more detailed information about the device before publication.
Author Response
Dear reviewer,
The manuscript has been revised according to the comments and all changes have been clearly highlighted using the “Track Changes” function in Microsoft Word as recommended to be easily visible to both editors and reviewers.
In the following, a point-by-point explanation of the implemented revisions concerning your comment:
- All information disclosed by the manufacturing company have been reported.
- The name of the prototype “Wellness glasses” has been converted into “Essilor Connected glasses”, as suggested by the manufacturing company.
- Figure 1.a has been replaced with a new one where the dimensions of the prototype are displayed.
- The first paragraph of Materials and Methods has been revised providing the information required (in blue the details added):
2.1 Essilor Connected glasses prototype
The EC glasses consist of a sensorized frame of glasses (Essilor International S.A., France) embedding a magneto-inertial measurement unit (Bosch Sensortec GmbH, Germany), a UV sensor (Vishay Intertechnology, Inc., USA), a rechargeable battery and a Bluetooth module inside the left temple (weight: 26 gr, size: 13.5x3.5x14 cm). The Bluetooth antenna allows the transmission of the acquired data to a dedicated mobile app (i.e. Zero mApp, Essilor International S.A., France) compatible with both Android and iOS environment. The Zero mApp analyzes the sensors data to provide in real-time the number of steps. The EC glasses, the Zero mApp and the EC glasses worn by a subject are represented in Figure 1a, 1b and 1c, respectively.
Please find enclosed the reviewed version of the manuscript.
Kind regards,
Alessia Cristiano
Author Response File: 
Author Response.docx
Reviewer 2 Report
The authors presented methods to realize the function of pedometer on smartglasses. The idea is interesting and matches with current research interests on wearable smart sensors. The introduction is informative. Methods are presented with details. Results look promising. A few comments which may help to improve the manuscript:
- Language needs to be polished to be more scientific.
- Section 1 and 2 can be combined together.
- The authors need to specify the manufacture/model/type/sensitivity of all the sensors on the wellness glasses with details.
Author Response
Dear reviewer,
The manuscript has been revised according to the comments and all changes have been clearly highlighted using the “Track Changes” function in Microsoft Word as recommended to be easily visible to both editors and reviewers.
In the following, a point-by-point explanation of the implemented revisions concerning Comment 1:
- The text has been revised throughout the entire document and it has been polished to be more scientific especially in the Introduction.
In the following, a point-by-point explanation of the implemented revisions concerning Comment 2:
- Section 1 and Section 2 have been combined together and some sentences have been re-arranged and better paraphrased to guarantee a smoother reading.
In the following, a point-by-point explanation of the implemented revisions concerning Comment 3:
- All information disclosed by the manufacturing company have been reported.
- The name of the prototype “Wellness glasses” has been converted into “Essilor Connected glasses”, as suggested by the manufacturing company.
- Figure 1.a has been replaced with a new one where the dimensions of the prototype are displayed.
- The first paragraph of Materials and Methods has been revised providing the information required (in blue the details added):
2.1 Essilor Connected glasses prototype
The EC glasses consist of a sensorized frame of glasses (Essilor International S.A., France) embedding a magneto-inertial measurement unit (Bosch Sensortec GmbH, Germany), a UV sensor (Vishay Intertechnology, Inc., USA), a rechargeable battery and a Bluetooth module inside the left temple (weight: 26 gr, size: 13.5x3.5x14 cm). The Bluetooth antenna allows the transmission of the acquired data to a dedicated mobile app (i.e. Zero mApp, Essilor International S.A., France) compatible with both Android and iOS environment. The Zero mApp analyzes the sensors data to provide in real-time the number of steps. The EC glasses, the Zero mApp and the EC glasses worn by a subject are represented in Figure 1a, 1b and 1c, respectively.
Please find enclosed the reviewed version of the manuscript.
Kind regards,
Alessia Cristiano
Author Response File: Author Response.docx
Round 2
Reviewer 1 Report
The author properly addressed the reviewer's comment and thus this manuscript is ready for publication as this is.
