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Rod monochromatism and blue cone monochromatism: pupillary, accommodative and convergence reactions to darkness.
Binocul Vis Strabismus Q. 1999; 14(4):291-8.BV

Abstract

PURPOSE

To elucidate the mechanism of paradoxical pupillary constriction to darkness (PPCD) and the clinical characteristics facilitating this phenomenon.

METHODS

Six rod monochromats, three blue cone monochromats, with three obligate BCM carriers, and ten age matched controls were studied. Pupillary responses, refractions and eye positions were measured with an infrared refractometer, with and without background room lighting while being simultaneously recorded on VHS (infrared) video tape from onset of darkness.

RESULTS

Only rod monochromats displayed typical paradoxical pupillary responses. Blue cone monochromats and obligate BCM carriers showed reduced pupillary contraction, compared to controls, but no paradoxical pupillary reaction. Changes neither in accommodation nor convergence were found during paradoxical pupillary constriction to darkness in our rod monochromats.

CONCLUSIONS

Paradoxical pupillary constrictions to darkness were seen in rod monochromats but were found not to be age or gender related. This constriction was accompanied neither by accommodation nor convergence changes. No significant differences in pupillary responses to darkness were observed in BCMs nor their carriers, although pupillary dilation to darkness seemed slightly impaired as compared to normals.

Authors+Show Affiliations

The Foerderer Eye Movement Center for Children, Wills Eye Hospital, Jefferson Medical College, Philadelphia, Pennsylvania 19107, USA.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

10652380

Citation

Ohmi, G, et al. "Rod Monochromatism and Blue Cone Monochromatism: Pupillary, Accommodative and Convergence Reactions to Darkness." Binocular Vision & Strabismus Quarterly, vol. 14, no. 4, 1999, pp. 291-8.
Ohmi G, Gottlob I, Wizov SS, et al. Rod monochromatism and blue cone monochromatism: pupillary, accommodative and convergence reactions to darkness. Binocul Vis Strabismus Q. 1999;14(4):291-8.
Ohmi, G., Gottlob, I., Wizov, S. S., & Reinecke, R. D. (1999). Rod monochromatism and blue cone monochromatism: pupillary, accommodative and convergence reactions to darkness. Binocular Vision & Strabismus Quarterly, 14(4), 291-8.
Ohmi G, et al. Rod Monochromatism and Blue Cone Monochromatism: Pupillary, Accommodative and Convergence Reactions to Darkness. Binocul Vis Strabismus Q. 1999;14(4):291-8. PubMed PMID: 10652380.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Rod monochromatism and blue cone monochromatism: pupillary, accommodative and convergence reactions to darkness. AU - Ohmi,G, AU - Gottlob,I, AU - Wizov,S S, AU - Reinecke,R D, PY - 2000/2/1/pubmed PY - 2000/2/1/medline PY - 2000/2/1/entrez SP - 291 EP - 8 JF - Binocular vision & strabismus quarterly JO - Binocul Vis Strabismus Q VL - 14 IS - 4 N2 - PURPOSE: To elucidate the mechanism of paradoxical pupillary constriction to darkness (PPCD) and the clinical characteristics facilitating this phenomenon. METHODS: Six rod monochromats, three blue cone monochromats, with three obligate BCM carriers, and ten age matched controls were studied. Pupillary responses, refractions and eye positions were measured with an infrared refractometer, with and without background room lighting while being simultaneously recorded on VHS (infrared) video tape from onset of darkness. RESULTS: Only rod monochromats displayed typical paradoxical pupillary responses. Blue cone monochromats and obligate BCM carriers showed reduced pupillary contraction, compared to controls, but no paradoxical pupillary reaction. Changes neither in accommodation nor convergence were found during paradoxical pupillary constriction to darkness in our rod monochromats. CONCLUSIONS: Paradoxical pupillary constrictions to darkness were seen in rod monochromats but were found not to be age or gender related. This constriction was accompanied neither by accommodation nor convergence changes. No significant differences in pupillary responses to darkness were observed in BCMs nor their carriers, although pupillary dilation to darkness seemed slightly impaired as compared to normals. SN - 1088-6281 UR - https://www.unboundmedicine.com/medline/citation/10652380/Rod_monochromatism_and_blue_cone_monochromatism:_pupillary_accommodative_and_convergence_reactions_to_darkness_ L2 - http://www.diseaseinfosearch.org/result/881 DB - PRIME DP - Unbound Medicine ER -