Larry Alexander, OD FAAO (1947 - 2016)

larry2

My heart is broken hearing of Larry's passing. Anyone who knew Larry was a better person for it. Last week Larry asked me to remove EyeLessons in its entirety so I reluctantly took it down. He also told me I could do with it whatever I want with it, so I'm putting it back up so others can enjoy Larry's style of education for a little longer.  EyeLessons was a labor of love, and I was constantly amazed at the content output by one of Optometry's leading educators.

Larry, I will miss you. It was an honor working with you and calling you a friend.

-Adam Parker, OD
(the guy behind the scenes of EyeLessons)

posted April 18, 2016

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Sym-Metrix® and Eye Disease

Sym-Metrix® and Eye Disease

Symmetry is expected in nature. Asymmetry is not expected. Symmetry is expected in virtually everything we see. Our brains have been conditioned to expect symmetry and when we view asymmetry it confounds our thought process. When evaluating the eye and associated adnexa the clinician must understand the analysis of symmetry as well as the underlying pathophysiology (tissue alteration) of the disease. Recognition of asymmetry is a tremendous asset in the practice of medical eye care and this discussion will address this principle.

Human Visual Analysis Of Electronic Data On A Liquid Crystal Display Monitor

Introduction Of Sepia Tones To The Current View Options In Medical Imaging

Human Visual Analysis Of Electronic Data On A Liquid Crystal Display Monitor

It has been established that the human eye sees color best but it is influenced by many factors. Issues such as chromatic aberration of the eye certainly impact on human perception as does brightness fatigue from the high-energy end of the spectrum…blue and ultraviolet light. Also blue light is inherently scattered more and because of chromatic aberration focuses in front of the retina creating a “blue defocus often estimated at the Snellen equivalent of 20/40”. The following from http://www.telescope-optics.net/eye_chromatism.htm illustrates both the proposed longitudinal and lateral eye chromatism.

Application of Optovue Trend Analysis in the Management of Patients

Application of Optovue Trend Analysis in the Management of Patients

Change or trend analysis is another tool to apply in the management of patients with ocular conditions that may affect the optic nerve, the retinal nerve fiber layer and the ganglion cell complex. It must be remembered that this is not the absolute tool for the decision making process but rather another tool in the management armamentarium.

Literature Review - June 2014

Lutein is a carotenoid that varies in breast milk depending on maternal intake. Data are lacking with regard to the effect of dietary lutein supplementation on breast milk lutein concentration during lactation and subsequent plasma lutein concentration in breast-fed infants. This study was conducted to determine the impact of lutein supplementation in the breast milk and plasma of lactating women and in the plasma of breast-fed infants 2-3 mo postpartum.

The Impact of Optic Disc Size on Differential Dx of Optic Nerve Disorders Using SDOCT

Congenital Microdisc

The Impact of Optic Disc Size on Differential Dx of Optic Nerve Disorders Using SDOCT

The power of spectral domain OCT (DIGITAL IMAGING) is incredibly impressive. Spectral Domain Optical Coherence Technology (SDOCT) has redefined the diagnosis and management of ocular disorders. However, the clinician interpreting the data must understand that anatomical characteristics can confound the resulting scans allowing for potential misinterpretation. Disc size and morphology is critical in the consideration of anatomical variations and how they impact on results and interpretation.

Literature Review - Feb 2014

Macular pigment optical density (MPOD) and age-related macular degeneration (AMD) are thought to be associated; however, the details are not yet clearly understood. This study aimed at investigating how retinal anatomical structures relate with the spatial MPOD distribution in single eyes. Study setting and methods: In a subgroup of the third follow-up examination of the Münster Aging and Retina Study (MARS) cohort (mean age 78.4 years), 124 single eyes of 79 participants were examined. MPOD was assessed using 2-wavelength autofluorescence (AF). Retinal thickness (RT) and fovea pit profile slopes were measured using optical coherence tomography (OCT). 

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