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. 2020 Nov;152(Suppl 1):S22-S23.
doi: 10.4103/ijmr.IJMR_2407_19.

An innovative filter for smartphones in tele-ophthalmology

Athul S Puthalath  1 , Neeti Gupta  2
Affiliations

An innovative filter for smartphones in tele-ophthalmology

Athul S Puthalath et al. Indian J Med Res. 2020 Nov.
No abstract available

PubMed Disclaimer

Conflict of interest statement

None

Figures

Fig. 1
Fig. 1
(A) Cobalt blue light unit (C-BLU) filter adapter consisting of an expandable smartphone holder arm (blue arrow) for housing the smartphone and the blue filter lens (green arrow) attached onto a movable length adjustable arm (red arrow). (B) C-BLU filter mounted on a smartphone using the expandable holder arm with the blue filter lens being aligned with the flashlight of the smartphone such that a cobalt blue light is emitted when the flashlight is turned on and image can be captured using the smartphone camera.
Fig. 2
Fig. 2
Photographs of common corneal pathologies acquired with slit lamp (A, C, E, and G) is being compared with C-BLU filter images (B, D, F, and H). (A-D) dry eye syndrome, (E and F) exposure keratopathy and (G and H) dendritic ulcer due to herpes simplex virus.
Fig. 3
Fig. 3
Various corneal pathologies have been captured using C-BLU filter and the corresponding corneal stain positive areas can be seen clearly. (A) Large epithelial defect due to firecracker. (B) limbal nodule preventing complete lid closure leading to inferior corneal exposure keratopathy. (C) Corneal laceration in superior cornea due to pencil stick injury. (D) Severe corneal ulcer and surrounding infiltrates.
Fig. 4
Fig. 4
(A) A one month old infant with pseudomembranous conjunctivitis was photographed using the C-BLU filter at various time-points. (B) A large epithelial defect with stain-positive areas on the cornea of infant on presentation. (C) The stain-positive areas have reduced in size after two days of treatment. (D) After four days of treatment, the epithelial defect shows regression with localization.
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