Conservation of archaeological daga (adobe) structures, Domboshaba National Monument, Botswana

Domboshaba is a Zimbabwe culture site in eastern Botswana. It had been suffering from neglect until an Africa 2009 documentation workshop was held there. This workshop recommended remedial conservation to arrest the deterioration of the dry stone walls and daga (abode) structures at the site. This paper presents some of the accomplishments of the workshop and the methods used to preserve the daga structures at Domboshaba. It also offers recommendations for others managing these types of sites in southern Africa.

Students' expectations of the virtual maternity clinic

The aim for the Virtual Maternity Clinic (VMC) is to engage students in learning about the role of the midwife and care of women during early pregnancy. The VMC, using Deakin Studies Online as a platform, includes LiveSim, videoed characters and Adobe Flash of four pregnant women with diverse issues. From an evaluation distributed to students prior to access of the VMC to identify their expectations, we found that undergraduate students wanted to learn how to interact with women during early pregnancy, whereas postgraduate students wanted strategies to learn about midwifery practice. Further development of the VMC is progressing to include a suite of programs incorporating the care of women during late pregnancy, labour and birth; and the time after birth.

Use of a photographic manipulation tool to assess corneal vascular response

Purpose. Corneal vasculature change in contact lens wearers has been linked to the level of hypoxia within the cornea. To assess the impact a treatment has on limbal vessels, a sensitive method of measurement and quantification is required.

Methods. A group of 21 highly myopic, hydrogel wearers, with preexisting signs of corneal hypoxia, were enrolled into a study where they wore sifilcon A silicone hydrogel lenses (Dk/t = 117), on a daily wear basis for 9 months. At all scheduled visits, photographs were taken of the superior, inferior, temporal, and nasal limbal regions which were then imported into Adobe Photoshop. A red-free filter was applied to enhance the contrast of the blood columns. In each quadrant, the length of the longest visible blood column was measured and the blood columns that penetrated >0.5 mm into the cornea were counted. A control group of 11 non-lens wearers was recruited. Their photographs were taken at the beginning of the study and 9 months later. An independent, masked observer assessed the photographs.

Results. There was a significant decrease in the maximum penetration of the blood column in all quadrants (p < 0.001) from baseline to the 9-month visit (e.g., superior: baseline 0.84 ± 0.39 mm; 9 months 0.63 ± 0.20 mm). There was also significant reduction in the number of visible blood columns longer than 0.5 mm in each quadrant (p < 0.001) from baseline to 9 months in all quadrants (e.g., superior: baseline 14.0 ± 8.2; 9 months 6.5 ± 6.0). The control group showed no change over time for the maximum blood column length (p = 0.638) or the number of columns >0.5 mm (p = 0.341).

Conclusions. A group of highly myopic subjects exhibited reduction in the maximum length and number of blood columns in the cornea when refit with a highly permeable silicone hydrogel material. The use of photography, along with Adobe Photoshop software, provides a reliable way of measuring corneal vascular responses over time.