Portable devices in ophthalmology

Aparelhos portáteis em oftalmologia

Dear Editor,

We have read, with strong enthusiasm, the ABO editorial by Malerbi¹ that illustrated diabetic retinopathy screening during COVID-19 pandemic. While there is a great interest in understanding the program’s potential, we noticed some additional points to this, which have been discussed herein.

Telemedicine is currently limited by several challenges, namely, a safe and effective implementation model, human resources utilization, suitability of diagnostic equipment, stakeholders’ adoption, clinical data management, and medico-legal implications. These problems are applicable worldwide, and the current teleophthalmology models are based on two central systems of operation. The first system deploys permanent satellite centers managed by trained operators, such as optometrists. This system has been adopted in the United Kingdom at the Moorfields Eye Hospital in London in the form of a cloud-based referral platform. This system was created to address the issue of unnecessary referrals to specialists as well as to create a direct communication channel among community optometrists or doctors, with high-quality diagnostic tests alongside patient clinical information to be reviewed by an ophthalmologist. It has also enabled clinical services to be directed appropriately to patients requiring urgent ophthalmic intervention, as 54% of the referrals have been found to be unnecessary². The second system uses a mobile teleophthalmology system that has been adopted in India, wherein it can travel to the rural areas where transportation and accessibility to eye care are suboptimal. This process requires a coordinated approach, starting from identifying suitable sites, increasing awareness/publicity, conducting population census, shipping the necessary equipment/team, and conducting teleconsultation and post-consultation follow-up. A typical setup in this system may consist of a group of trained optometrists and equipment, including autorefractor, slit lamp, tonometry, and nonmydriatic fundus camera. Frequently, for more complex eye conditions, video conferencing with an ophthalmologist is possible, which provides point- of-care triaging and the determination of follow-up care³. Moreover, in both the cases, the patient would has to travel to the ophthalmic site of examination at a certain time point, if not at present. One of the significant considerations for both the systems discussed above is that the diagnostic equipment deployed is bulky, expensive, and difficult to operate, with limiting scalability and accessibility. Both these systems however circumvent the need for an on-site ophthalmologist, which is a requirement of the teleophthalmology systems, although the present challenge is the lack of a suitable diagnostic ophthalmic equipment. In fact, there is an unmet need for a new breed of devices designed to be community-friendly, which includes the factors of portability, ease-of-use, and affordability. Ideally, these devices would be used by patients. Thus, new healthcare models and technologies need to be developed to meet the increasing demands of rapidly aging patient populations.

Presently, there are some commercially available portable diagnostic devices available in the ophthalmic field, such as fundus cameras, auto-refractors, slit lamps, and tonometry devices, for example, the Spot^® Vision Screener autorefractor, The Reichert^® TONO-PEN^® XL Tonometer, and Keeler PSL One Portable Slit Lamp. For the retinal examination, several portable cameras are presently available that can be connected for transferring images to specialists and reading centers. Favorable, several of these aspects are currently being consigned by industry and investors, which support the acquisition of color fundus photographs using smartphones with a condensing lens or an ophthalmoscopy adaptor such as the Portable Eye Examination Kit (PEEK), D-Eye Device, and Ocular Cellscope. The advantages of these systems include portable technology that enables high-quality image capturing to assess age-related macular degeneration and diabetic retinopathy (DR)⁴.

Portable devices play a significant role in monitoring and managing healthcare for a wide range of patients. A large-scale spectrum of portable medical devices is already available in the market, while various next-gen devices are still under development. These devices are popularly being used in ever-increasing applications such as those used for cardiac, respiratory, and wellness concerns, including the following: apnea monitors, continuous positive airway pressure machines, electrocardiogram monitors, blood glucose meters, insulin infusion pumps, blood pressure monitors, pulse oximeters, and ultrasound devices. The use of portable medical device is rapidly expanding since the advancements in the development of wireless technologies have enhanced home low-cost sensor technologies, low power consumption, repeatability, and reliability.

The new concept of miniaturized portable devices in ophthalmology is based on increasing accessibility, affordability, and integrability. The COVID-19 pandemic is believed to act a catalyst in promoting the acceptance and adoption of these devices to spur the development of new decentralized chronic eye care models complementing the pre-existing system. These devices do not just provide continuous and non-invasive monitoring of health parameters, but, through connectivity, also offer real-time updates to the healthcare workers. Portable devices possess the potential to revolutionize eye care, making high-quality services sustainable and accessible to everyone.

• Funding: This study received no specific financial support.

REFERENCES

• ¹
  Malerbi FK, Morales PHA, Regatieri CVS. Diabetic retinopathy screening and the COVID-19 pandemic in Brazil. Arq Bras Oftalmol. 2020;83(4):V-VI.
• ²
  Sim DA, Mitry D, Alexander P, Mapani A, Goverdhan S, Aslam T, et al. The evolution of teleophthalmology programs in the united kingdom: beyond diabetic retinopathy screening. J Diabetes Sci Technol. 2016;10(2):308-17.
• ³
  Bai VT, Murali V, Kim R, Srivatsa SK. Teleophthalmology-based rural eye care in India. Telemed J Health. 2007;13(3):313-21.
• ⁴
  Wintergerst MW, Mishra DK, Hartmann L, Shah P, Konana VK, Sagar P, et al. Diabetic retinopathy screening using smartphone-based fundus imaging in Indian. Ophthalmology. 2020;S0161-642(20): 30463-2.

Reply: portable devices in ophthalmology

Resposta: aparelhos portáteis em oftalmologia

Authorship SCIMAGO INSTITUTIONS RANKINGS

Dear Editor,

We greatly appreciate the valuable input by Dr. Daniel A. Ferraz and colleagues on our recently published editorial¹. We agree with their conclusion on the great potential of portable devices to close the access gaps in eye care, especially among the vulnerable and underserved populations.

Interestingly, we recently examined diabetic reti­nopathy (DR) screening models based on portable retinal cameras, both in the urban² and remote, rural settings³; in both these scenarios, a strategy based on telemedicine and portable, low-cost retinal cameras is believed to increase the coverage of eye examinations.

We strongly believe that telemedicine, portable retinal cameras, and artificial intelligence are strong tools that, when well-coordinated, can reduce the cases of preventable blindness in low-to-middle income countries, as with the successful screening programs conducted elsewhere⁴. The design of the Brazil’s Family Health Strategy is compatible with the capillarization of such actions toward health care.

• Funding: This study received no specific financial support.

REFERENCES

• ¹
  Malerbi FK, Morales PHA, Regatieri CVS. Diabetic retinopathy screening and the COVID-19 pandemic in BRazil. Arq Bras Oftalmol. 2020;83(4):V. doi: 10.5935/0004-2749.20200070.
  » https://doi.org/10.5935/0004-2749.20200070
• ²
  Queiroz MS, de Carvalho JX, Bortoto SF, de Matos MR, das Graças Dias Cavalcante C, Andrade EAS, Correa-Giannella ML, Malerbi FK. Diabetic retinopathy screening in urban primary care setting with a handheld smartphone-based retinal câmera. Acta Diabetol. 2020; 4:1-7. doi: 10.1007/s00592-020-01585-7.
  » https://doi.org/10.1007/s00592-020-01585-7
• ³
  Korn Malerbi F, Lelis Dal Fabbro A, Botelho Vieira Filho JP, Franco LJ. The feasibility of smartphone based retinal photography for diabetic retinopathy screening among Brazilian Xavante Indians. Diabetes Res Clin Pract. 2020; 168:108380. doi: 10.1016/j.diabres.2020.108380.
  » https://doi.org/10.1016/j.diabres.2020.108380
• ⁴
  Scanlon PH. The English National Screening Programme for diabetic retinopathy 2003-2016. Acta Diabetol 2017; 54(6):515. doi: 10.1007/s00592-017-0974-1.
  » https://doi.org/10.1007/s00592-017-0974-1

Publication Dates

• Publication in this collection
  15 Jan 2021
• Date of issue
  Nov-Dec 2020

History

• Received
  17 Sept 2020
• Accepted
  19 Sept 2020