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