Gladiatorial Spectacles in Crete

Coloured Spectacles

Presbyopic spectacles in elderly Tanzanians.

does exist. Wong et al. had considered variables that were closely related to one another (which was supposed to be evaluated by Pearson’s correlation coefficients or by clinical judgment) and chose only the most significant one. However, correlations among selected variables cannot be totally avoided. The variance inflation factor can be used to evaluate the extent of collinearity, but selecti...

British Standards for Spectacles.

EARLIER articles have reviewed parts of the work of the British Standards Institution in the field of standardization of spectacles (Brit. J. Ophthal., 1956, 40, 611; 1959, 43, 509), but the publication of B.S. 3521, completing the series of Standards relating to spectacles, provides the opportunity for a general survey. The nine British Standards fall into two categories with some overlap. The...

Origin of spectacles in India.

The European records of the origin of spectacles are very controversial. The suggestion that spectacles were first invented during the I 3th century in Italy by an unknown layman of Pisa is not convincing, because there are also references to spectacles in Hindu literature at about the same time. In the life of Vyasaraya (1446-1539), written in Sanskrit by his contemporary, the poet Somnath, th...

Russell’s Logicism through Kantian Spectacles