Mr. Muhammad Miqdad Khan Profile

Muhammad Miqdad Khan

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optical system designing , biomedical optics

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Publications (2)

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Proceedings Article | 4 December 2024 Paper

Portable smartphone-based fundus camera using single lens

Muhammad Miqdad Khan, Majida Kazmi, Saad Ahmed Qazi, M. A. Rehman Siddiqui

Proceedings Volume 13440, 134400B (2024) https://doi.org/10.1117/12.3055170

KEYWORDS: Cameras, Retinal scanning, Eye, Retina, Portability, Eye models, Retinal diseases

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Fundus imaging is a crucial aspect of ophthalmology, and the development of smartphone-based solutions has been a rapidly growing field for over a decade. Despite the known benefits of using smartphones for retinal imaging, such as ease and cost-effectiveness, there has been a lack of available devices in this domain as there are only two Asian devices and only eleven devices available commercially worldwide. The development of more devices also helps in reduction of cost and competition makes the quality better. This study addresses this gap by developing a local, inexpensive smartphonebased portable fundus camera using a single lens. The device was designed and simulated using Zemax OpticStudio and then physical model was developed and tested on a Heine Ophthalmoscope trainer eye model. The results obtained were comparable to those of the gold standard Topcon tabletop fundus camera, with a wide field of view of 46 degrees. Additionally, this device is 20 times cheaper and 3 times smaller than conventional tabletop cameras. The potential for this device to meet the requirements of retinal imaging in an outreach setting, particularly in middle or low-income countries, makes it a groundbreaking solution for accessible and affordable retinal imaging in under-served areas.

Proceedings Article | 27 August 2020 Paper

The accomplishment of the phenomenon of perfect optical cloaking using a multi-lens system

Muhammad Miqdad Khan, Rafey Iqbal Rahman

Proceedings Volume 11561, 1156108 (2020) https://doi.org/10.1117/12.2574944

KEYWORDS: Lenses, Geometrical optics, Metamaterials, Matrices

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Different cloaking technologies exist but have not yet been practically applicable as a phenomenon in itself and a wide variety of applications owing to the treatment of the phenomenon initially with a mathematical approach, hence turning the interesting phenomenon into a boring, cumbersome and an impractical one by neglecting the feasibilities involved at a particular yet crucial stage. This paper discusses the phenomenon of paraxial ray optical cloaking with a practical approach, void of heavy mathematical equations. The technique elaborated in this paper is not dependent upon the distance between the pairs of lenses since lenses with the same focal lengths have been used in the experiment, contrary to which was done in prior researches and experiments. It is noted that the perfect paraxial optical ray cloaking is observed at a very low cost when compared to other experimental setups. This low cost helps in setting up experiments for the education sector. The experiments for the achievement of the invisibility can be performed by students of even secondary and higher secondary standards due to the affordability. However, it is also observed that this experimental setup is currently not applicable for hiding or 'cloaking' objects larger in size, but larger objects can be hidden or 'cloaked' if the diameter of the lenses is increased.

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