Biomedical subjects

H J van den Brom

Publications and source records attributed to H J van den Brom.

4 recordsLinked to original sources

PubMed1997

Axial length as a risk factor to branch retinal vein occlusion.

PURPOSE: To determine whether axial length is a factor in branch retinal vein occlusion. METHODS: Axial length measurements in a group of 24 patients with a unilateral branch retinal vein occlusion were compared with the axial length measurements in a control group. Axial length measurements were taken with an A-scan; affected and unaffected eyes were measured. The control group consisted of 24 individuals who matched the patients in the branch retinal vein occlusion group in age, systemic hypertension status, and diabetes mellitus status. RESULTS: The affected and fellow eye in patients in the branch retinal vein occlusion group did not differ statistically in axial length (P = 0.26). The mean axial length of affected eyes in the branch retinal vein occlusion group was 22.76 +/- 0.92 mm, and the mean axial length of control eyes was 23.36 +/- 1.08 mm. The difference in axial length between the eyes with a branch retinal vein occlusion and the eyes in the control group was statistically significant (P = 0.023). CONCLUSION: The axial length of affected eyes of patients with branch retinal vein occlusion was on average 0.60 mm shorter than that of eyes of matched controls (95% confidence interval, 0.30-0.90 mm). The shorter axial length could be a local risk factor in the pathogenesis of a branch retinal vein occlusion.

Aged↗

PubMed1995

Measurement of visual acuity with two different charts; a comparison of results and repeatability in patients with cataract.

PURPOSE: To compare two different optotypes to measure visual acuity. METHODS: Experiment 1: Fifty patients with moderate cataracts were asked to read a chart consisting of letters of the alphabet (Sloan letters) first and a chart comprising Landolt's broken rings afterwards. Experiment 2: Half of patients were instructed to repeat the reading with a second letter chart, the other half was instructed to read the chart with the broken rings again. RESULTS AND CONCLUSIONS: Experiment 1: It was found that with the letter chart more optotypes (two to four) were recognized than with the broken ring chart. The different result of visual acuity measurement with the two optotypes is irrespective of the visual acuity. Experiment 2: The re-read instruction revealed that the measurements were reproduced equally for both charts.

Cataract↗

PubMed1991

Lens reflectometry with a CCD video camera and computer image analysis.

Lens reflectometry is a useful method of determining the back scatter of light from the cataractous lens. Making use of normal programmes, the personal computer can be used for the quantitative determination of the lens reflex, as seen in the slit-lamp image. If three different images of the same eye are compared, it appears that the mean variation in the back-scatter readings made by our method is 8.3%.

Aged↗

PubMed1989

Intra-ocular light scatter in pseudophakia.

In 22 patients (23 eyes), who had undergone an uncomplicated cataract extraction with implantation of a posterior chamber lens in otherwise normal eyes 11 to 44 weeks previously, the intra-ocular light scatter was measured with an IOI stray light meter. All the eyes examined had little or no after-cataract. A regression curve for stray light values in normal eyes as function of age was used as reference. The measurements show that the intra-ocular light scatter in pseudophakic eyes with little or no after-cataract increases by a factor 2. This increase must be caused by the combination implant lens-posterior capsule.

Adolescent↗