Direct Discrimination of Quantum States by the Human Eye

NCT ID: NCT05913063

Last Updated: 2024-08-27

Basic Information

• Recruitment Status: RECRUITING
• Clinical Phase: NA
• Total Enrollment: 50 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2023-06-26
• Study Completion Date: 2029-10-01

Brief Summary

Age-related macular degeneration (AMD), is a debilitating eye disease that causes a loss of central vision. The prevalence of AMD increases exponentially with age and causes a significant impact through both medical expenses and the social and economic costs associated with vision loss. AMD is the global leading cause of blindness among people over the age of 60. Detection of this eye disease at early stages coupled with prompt treatment can prevent vision loss; however, modern diagnosis methods are ineffective at diagnosis of AMD before vision loss occurs. While a range of available treatment options has been effective at slowing vision loss due to AMD, no treatment exists which can recover lost vision. The investigators propose to apply tools developed in quantum information science to diagnose AMD before vision has been affected, drastically improving health outcomes for patients with AMD.

Detailed Description

There has been tremendous progress in generating and detecting structured light which possesses advantageous propagation characteristics such as quantized orbital angular momentum (OAM), non-diffraction, and self-healing. These special beams have found applications in microscopy, encoding and multiplexing of communications, and manipulation of matter. Here the investigators bring the structured light toolbox to vision sciences for the first time and expand the space of possible stimuli.

A healthy macula possesses azimuthally ordered dichroic fibres that act as a radial polarization filter, enabling a typical person to perceive linearly polarized light through the entoptic phenomena known as Haidinger's brushes. Despite significant interest in the application of this phenomenon to the detection of age-related macular degeneration, no device has currently seen widespread adoption in a clinical environment. This is due to the difficulty in observing Haidinger's brush, the imprecise measurements that this test can extract, and the difficulty in instructing patients during these tests.

Leveraging the quantum-inspired toolbox developed in the field of structured light, the investigators can project polarization-coupled OAM states of light directly on a person's retina. This enables the investigators to create arbitrary entoptic patterns in a person's vision based on the structure and chemical composition of their subjective macula, and the investigators have the opportunity to develop a litany of novel diagnostic tests to characterize and quantify the health of the macula.

Conditions

Age-Related Macular Degeneration

Study Design

• Allocation Method: NA
• Intervention Model: SINGLE_GROUP
• Primary Study Purpose: DIAGNOSTIC
• Blinding Strategy: NONE

Study Groups

Participants with Age-Related Macular Degeneration

Conducting the psychophysical task on the perception of OAM-coupled polarized light

Group Type: EXPERIMENTAL

Structured Light Imaging Microscopy

Intervention Type: DEVICE

Conducting the psychophysical task on the perception of OAM-coupled polarized light created using the experimental setup - Structured Light Imaging Microscopy (SLIM). Four types of vortex orbital angular momentum, differing by the number of fringes l=5;10; 15;20, will be presented for 0.5s per trial during which an azimuthally varying entoptic profile rotated clockwise or counterclockwise. A circular mask with a varying radius will be placed at fixation, thus the task will be performed at varying eccentricities. Circular obstruction of the area will be achieved due to the high refresh-rate structured light modulator. The threshold mask size will be changed by a 2up/1down staircase method (71% accuracy for the estimation of mask size).

Interventions

Structured Light Imaging Microscopy

Conducting the psychophysical task on the perception of OAM-coupled polarized light created using the experimental setup - Structured Light Imaging Microscopy (SLIM). Four types of vortex orbital angular momentum, differing by the number of fringes l=5;10; 15;20, will be presented for 0.5s per trial during which an azimuthally varying entoptic profile rotated clockwise or counterclockwise. A circular mask with a varying radius will be placed at fixation, thus the task will be performed at varying eccentricities. Circular obstruction of the area will be achieved due to the high refresh-rate structured light modulator. The threshold mask size will be changed by a 2up/1down staircase method (71% accuracy for the estimation of mask size).

Intervention Type: DEVICE

Eligibility Criteria

Inclusion Criteria

• Participants who are clinically diagnosed with a vision disease affecting their macula
• Older adults who are matched for age.
• Participants who are clinically diagnosed with glaucoma
• Participants who have normal vision.
• One aged-matched control with normal vision will be recruited for each of the diagnosed groups (born in the same year).

Exclusion Criteria

• Participants with any additional eye diagnosis or condition

• Minimum Eligible Age: 18 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

University of Waterloo

OTHER

Sponsor Role: collaborator

The Hong Kong Polytechnic University

OTHER

Sponsor Role: collaborator

Centre for Eye and Vision Research

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Benjamin Thompson, PhD

Role: PRINCIPAL_INVESTIGATOR

Centre for Eye and Vision Research

Mukhit Kulmaganbetov, MD, PhD

Role: STUDY_DIRECTOR

Centre for Eye and Vision Research

Locations

Centre for Eye and Vision Research Limited

Hong Kong, Guangdong, Hong Kong

Site Status: RECRUITING

Countries

Hong Kong

Central Contacts

Benjamin Thompson, PhD

Role: CONTACT

ben.thompson@cevr.hk

+852-3169-9631

Mukhit Kulmaganbetov, MD, PhD

Role: CONTACT

mukhit.k@cevr.hk

+852-3169-9631

Facility Contacts

Peter CK Pang, PhD

Role: primary

csm@cevr.hk

+852-2766-7927

Other Identifiers

SLIM

Identifier Type: -

Identifier Source: org_study_id