Springer Science and Business Media LLC

Une méthode de dosage du cuivre dans l'humeur aqueuse est mise au point; chez le sujet normal le taux est de 12,26 γ pour 100 g d'humeur aqueuse. Les variations du cuivre sont étudiées dans trois domaines:

The performance of multifocals is partly determined by the degree to which contrast at the focussed image is reduced by out of focus images. This paper discusses how optical performance may vary with lens design and includes consideration, with available core study results, of multifocal designs marketed by lolab, 3M, AMO, loptex, Storz and Domilens. For most lenses an acuity of 20/40 and J3 can be achieved unaided in over 70% of best case eyes and J2 with the distance correction in over 80%. However the risk of disappointment tends to prevent a more widespread use of multifocals among surgeons, and an explanation is given as to possible reasons.

Age-related macular degeneration (AMD) is affecting an increasing number of people, with 2.95 million people estimated to be affected in the USA by 2020. Possible preventive agents, such as vitamins and supplements have been studied and new treatment options for AMD have been developed in recent years. What role does electrophysiology play as a sensitive outcome measure? The most commonly used tests are the full-field electroretinogram (ffERG) and the multifocal ERG (mfERG). Test results from patients with AMD and reduced central vision need special attention in respect to fixation pattern, age-matched control data, and retinal luminance. Advantages, disadvantages and limitations of techniques will be considered, together with a review of published studies.

The literature concerning the aetiology and histopathogenesis of pterygium is reviewed. A hypothesis suggesting how these theories may be inter-related in the production of pterygium is propounded.

Purpose: To study the effect of body temperature on the murine electroretinogram (ERG). Methods: The corneal ERG elicited by a strobe flash from dark-adapted mice was recorded using a saline wick electrode while measuring rectal temperature continuously. The mouse was placed within a cylindrical coil of tubing through which water circulated from a temperature controlled bath. The body temperature of the mouse was changed stepwise between 30 and 37 °C. Results: ERGs of approximately normal configuration were recorded at body temperature ranging between 30 and 37 °C. The maximum amplitude of the a- and b-waves varied linearly with temperature. The rate of change of b-wave amplitude was about 100 μV/degree. At 30 °C, maximum b-wave amplitude was about 400 μV; at 37 °C it was about 1000 μV. A change in body temperature produced a rapid change in ERG amplitude. Conclusion: The murine ERG is very sensitive to changes in temperature. In order to monitor the ERG accurately over time, continuous recording of body temperature is essential.