Episode 39 - Biochemistry of Cataractogenesis

What really causes the lens to lose its transparency?

Hi I am Dr Thomas Whitelaw and in this episode of Basic Sciences in Ophthalmology, we dive into the biochemical foundations of cataract formation, breaking down the molecular processes that drive one of the most common causes of visual impairment worldwide.

We explore how oxidative stress damages lens crystallins, leading to protein aggregation and light scatter. You’ll learn how UV radiation accelerates cataractogenesis through reactive oxygen species and photochemical reactions, and why these effects worsen with age.

Finally, we examine the lens’s antioxidant defense systems, including glutathione, ascorbate, and key enzymes—and how their gradual decline tips the balance toward irreversible damage.

Topics covered:

1. Lens protein oxidation and aggregation

2. UV-induced oxidative damage

3. Antioxidant defenses and their failure.

Perfect for ophthalmology trainees, this episode connects basic science with clinical relevance, helping you understand cataract formation at a molecular level.

Episode 38 - Femtosecond and Excimer LasersWelcome to Episode 38 of Basic Sciences in Ophthalmology.

I am your host Dr Thomas Whitelaw and in this episode, we explore the physics and clinical application of two of the most important laser technologies in modern ophthalmology: excimer lasers and femtosecond lasers.

These technologies underpin refractive surgery and are increasingly used in cataract surgery. Understanding their mechanisms is essential not only for exams but also for appreciating how precision tissue interaction is achieved at a microscopic level.

Episode 37 - Phacoemulsification Physics

Welcome back to Basic Sciences in Ophthalmology.

I am your host Dr Thomas Whitelaw and in this episode, we will explore the physics underpinning phacoemulsification, the cornerstone of modern cataract surgery. Understanding how ultrasound energy interacts with ocular tissues essential not only for surgical efficiency but also for minimising complications such as thermal injury and endothelial damage.

We will break this down into three key areas:

1. Phaco handpiece physics

2. Ultrasound power modulation

3. Thermal safety and tip design

Episode 36 – Radiological Imaging in Ophthalmology.

Hi I’m your host Dr Thomas Whitelaw and in this episode of Basic Sciences in Ophthalmology, we explore the principles of radiological imaging in eye disease. Learn the key differences between CT and MRI in orbital imaging, how contrast agents enhance diagnostic accuracy, and how clinicians interpret imaging to characterise lesions affecting the orbit, optic nerve, and visual pathways. A must-listen for understanding how imaging supports diagnosis in trauma, tumours, and neuro-ophthalmology.

Episode 35 - Keratometry and Aberrometry.

Welcome back to Basic Sciences in Ophthalmology. I am your host Dr Thomas Whitelaw and in this episode, we explore two essential optical measurement techniques that underpin modern clinical practice—keratometry and wavefront aberrometry. These tools allow us to quantify corneal curvature and optical imperfections of the eye, forming the backbone of refractive assessment and surgical planning. Understanding their physical principles is key to interpreting results and applying them effectively in clinical care.

Episode 34 - Visual Field Testing (Perimetry) Principles

Hi I’m Dr Thomas Whitelaw, welcome back to Basic Sciences in Ophthalmology, the podcast that breaks down the scientific foundations of eye disease and clinical practice for ophthalmology trainees.

In today’s episode we explore the principles of visual field testing, also known as perimetry. Visual field assessment is a cornerstone of modern ophthalmology because it allows clinicians to evaluate the functional integrity of the visual pathway, from the retina through the optic nerve to the visual cortex.

Episode 33 – Doppler Flowmetry and Retinal Circulation

Basic Sciences in Ophthalmology

Hi, I am your host Dr Thomas Whitelaw and In this episode, we explore how Doppler flowmetry is used to study blood flow within the eye. We begin with the laser Doppler principle, explaining how frequency shifts in scattered laser light can reveal the movement of red blood cells in retinal vessels. We then examine how these signals are used to estimate retinal blood flow and microcirculation.Finally, we discuss the clinical importance of ocular perfusion, focusing on applications in glaucoma and retinal vascular diseases such as diabetic retinopathy. This episode links the physics of Doppler measurement with its role in understanding ocular vascular health and disease.

Episode 32 - Spectral vs Time-Domain OCT

Hi, I am Dr Thomas Whitelaw and in this episode, we explore one of the most important imaging advances in modern ophthalmology — Optical Coherence Tomography, and specifically the distinction between Time-Domain OCT and Spectral-Domain OCT.

To understand the difference, we must begin with the physics of interferometry, low-coherence light, and axial resolution.