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Arch Ophthalmol. 1995 Sep;113(9):1138-43.

Impact of age, various forms of cataract, and visual acuity on whole-field scotopic sensitivity screening for glaucoma in rural Taiwan.

Author information

1
Dana Center For Preventive Ophthalmology, Johns Hopkins University, Baltimore, Md, USA.

Abstract

OBJECTIVE:

To evaluate the impact of age, various forms of cataract, and visual acuity on whole-field scotopic sensitivity screening for glaucoma in a rural population.

DESIGN:

Clinic-based study with population-based recruitment.

SETTING:

Jin Shan Township near Taipei, Taiwan.

SUBJECTS:

Three hundred forty-six residents (ages, > or = 40 years) of Jin Shan Township.

INTERVENTIONS:

Whole-field scotopic testing, ophthalmoscopy with dilation of the pupils, cataract grading against photographic standards, and screening visual field testing in a random one-third subsample.

MAIN OUTCOME MEASURES:

Whole-field scotopic sensitivity (in decibels) and diagnostic status as a case of glaucoma, glaucoma suspect, or normal.

RESULTS:

Participants in Jin Shan Township did not differ significantly in the rate of blindness, low visual acuity, or family history of glaucoma from a random sample of nonrespondents. Scotopic sensitivity testing detected 100% (6/6) of subjects with open-angle glaucoma at a specificity of 80.2%. The mean +/- SE scotopic sensitivity for six subjects with open-angle glaucoma (32.78 +/- 1.51 dB) differed significantly from that of 315 normal individuals (38.51 +/- 0.22 dB), when adjusted for age and visual acuity (P = .05, t test). With linear regression modeling, factors that correlated significantly with scotopic sensitivity were intraocular pressure, screening visual field, best corrected visual acuity, presence of cortical cataract, and increasing age.

CONCLUSIONS:

Although cataract affects the whole-field scotopic threshold, it appears that scotopic testing may be of value in field-based screening for glaucoma.

[Indexed for MEDLINE]

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