Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1996-03-29
1997-05-20
McPherson, John A.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
252586, G02C 710
Patent
active
056317204
ABSTRACT:
The invention relates to ophthalmic lenses comprising a transparent organic polymer material and photochromic compounds of general formula ##STR1## wherein R.sup.a, R.sup.b and R.sup.c are hydrogen; alkyl; aryl; OR, SR, COR or COOR, where R denotes hydrogen, alkyl or aryl, amino of formula NR.sub.1 R.sub.2 where R.sub.1 and R.sub.2 denote hydrogen, alkyl, cycloalkyl or an aryl; a halogen atom; a mono- or polyhaloalkyl group; or an NO.sub.2, CN or SCN group; n and m denote integers from 1 to 5; p is equal to 1 or 2; and H is an aromatic heterocycle having the general formula: ##STR2## wherein: X, Y and Z represent independently of each other, a CR.sub.8 radical or a nitrogen atom, and one or two of X, Y and Z is a nitrogen atom and R.sub.8 is selected from the group consisting of hydrogen, C.sub.1 -C.sub.6 alkyl and phenyl; and R.sub.4 is selected from the group consisting of hydrogen, C.sub.1 -C.sub.6 alkyl and phenyl.
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Guglielmetti Robert
Pozzo Jean L.
Samat Andre
Essilor International "Compagnie Generale d'Optique"
McPherson John A.
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