Prevalence of lattice degeneration and its relation to axial length in severe myopia.

We studied 436 eyes of 218 patients with myopia of -6.00 diopters or more in both eyes. Of 218 patients, 72 (33.

Practical anterior segment fluorescein angiography.

Anterior segment fluorescein angiography is a useful investigative technique for diagnosing and assessing anterior segment disease. However, a number of technical problems are inherent in current methodology, such as confounding reflexes, off-axis illumination, and shallow depth of field. We developed a simple technique using readily available equipment, polarized light, and an easy-to-construct auxiliary bracket to provide an inexpensive and optimal photographic system for anterior segment fluorescein angiography.

Comparative study of vitreoretinal relationships using biomicroscopy and ultrasound.

We prospectively studied 29 consecutive eyes with proliferative diabetic retinopathy that showed media clear enough to enable characterization of vitreoretinal relationships by biomicroscopy. Vitreoretinal relationships were also determined by contact B-scan ultrasound. With both techniques, these relationships were documented by photographs and drawings.

[Definition of intrauterine growth retardation].

In order to answer the question as to the limit of intrauterine foetal growth retardation, we compared three weight values at birth: two standard deviations below the mean, namely the fifth and tenth percentiles. The comparisons were made on the intrapartum and early neonatal mortality rates of 19,256 infants born during 1980 in "La Paz" Maternity Hospital of Madrid. Our results show that we have to consider as newborn with a growth retardation those infants whose weight at birth is lower than the fifth percentile for their gestational age and sex.

[Effect of the amniotic fluid on the formation of spontaneous rosettes].

Since half of the fetal transplantation antigens are paternal in origen, the conceptus could be considered as a particular allogeneic graft not rejected by the mother. The reason for this particular kind of tolerance remains mostly unknown, and an enormous amount of experimental work, clinical observations and hypothesis, sometimes contradictory, has been accumulating in the scientific literature. So far no one has been able to set an unifying and coherent explanation.