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PubMed2002

Achieve new vision screening objectives.

Visual impairment ranks among the top ten disabilities in the United States. Early diagnosis and treatment can prevent permanent blindness in many cases. This article identifies the leading causes of visual impairment, target populations, and screening techniques for primary care. The author also provides key counseling information and valuable resources for clinicians and patients.

Adolescent↗
PubMedDate not supplied

Screening the vision of school-aged children: an interdisciplinary research approach.

The authors are registered nurses (RNs) and members of an Interdisciplinary Vision Screening Research Group investigating how best to screen children's vision, incorporating the assessment of binocular visual function. The aims of this pilot study were: to detect any visual skill problems of children in a Reception class (n = 28) using the Oyarzun Vision Screening Kit; to describe the behaviour of the children during the screening; to calculate the time taken to screen each child and to establish the interrater reliability (IRR) between the RNs and an optometrist. Thirteen of the children (46%) had at least one visual problem, necessitating follow-up assessment. Other results and research implications are also discussed.

Child↗
PubMed2001

Comparison of preschool vision screening methods in a population with a high prevalence of astigmatism.

PURPOSE: To compare the effectiveness of four methods of screening 3- to 5-year-old children for astigmatism high enough to require spectacle correction. METHODS: Lea Symbols Visual Acuity Screening (LSVAS), MTI Photoscreening (MTIPS), Nidek KM-500 Keratometry Screening (KERS), and Retinomax K-Plus Noncycloplegic Autorefraction Screening (NCARS) were attempted on 379 preschool children who are members of a Native American tribe having a high prevalence of astigmatism that is primarily corneal in origin. The need for spectacle correction was determined by cycloplegic refraction. Receiver Operating Characteristic (ROC) curves were fit, confidence intervals were determined, and area under the curves was compared. RESULTS: Astigmatism > or = 1.00 D was present in the right eye of 47.5% and in the left eye of 48.0% of children. Spectacles were prescribed for children < 48 months of age who had cylinder > or = 2.00 D and children > or = 48 months who had cylinder > or = 1.50 D, with the result that 33% of subjects required spectacles. Area under the ROC curve was 0.98 for NCARS, 0.92 for KERS, 0.78 for MTIPS, and 0.70 for LSVAS, and each of these values differed significantly from the other three (all P < 0.007). Testability was significantly higher for NCARS (99.5%) and KERS (99.7%) than for MTIPS (93.5%) and LSVAS (92.0%). CONCLUSIONS: In a population that included many children with astigmatism, objective, fully automated screening methods (NCARS and KERS) were superior to both visual acuity screening and photoscreening with subjective interpretation in identifying children who had astigmatism requiring spectacle correction.

Amblyopia↗
PubMed1991

Vision screening of an adolescent inner city population: a high failure rate and low compliance on follow-up care.

625 inner city high school students were screened. Some 45.8% of this sample were designated as special education students. The referral rate was 52.3% for all students screened. Detailed failure rate by group and category are reported. Special education students had a higher incidence of uncorrected hyperopia and binocular dysfunction. Intervention strategies to improve a poor compliance rate for follow-up care are discussed.

Adolescent↗
PubMed1994

A statistical analysis of Modified Clinical Technique vision screening of preschoolers by optometry students.

Fourth year optometry students screened 745 preschoolers using a slightly altered Modified Clinical Technique (MCT) under the supervision of a faculty doctor. Children who failed the MCT were randomly selected and then matched by age, sex, and ethnic origin to children who had passed the screening battery. The 61 screening failures and 45 matched controls were later given full eye examinations with cycloplegia by University of Alabama at Birmingham faculty doctors who were unaware of the screening results. The positive predictive value (PPV) (0.52) and negative predictive value (NPV) (0.78) of the MCT were calculated directly from the 2 x 2 contingency table crossing screening results and a standard diagnosis. Sensitivity [0.50, k(1,0) = 0.29], specificity [0.79, k(0,0) = 0.30], efficiency [0.70, k(0.5,0) = 0.29] of the MCT, and the prevalence (0.30) of children failing the standard diagnosis were estimated using statistics appropriate to the prospective sampling design. The reproducibility of the diagnosis, estimated by analyzing multiple, independent diagnosis of each study child by seven doctors was moderate (kappa D 0.58). Statistics summarizing the agreement between the MCT and the diagnosis by the individual study doctor are similar to those obtained with comparison to the standard diagnosis. The characteristics of the MCT may be generalized only to similar populations that are screened by clinicians with similar experience, using the same tests.

Child↗