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Near Acuity and Discrimination

Description and Rationale

Reduced near acuity and discrimination may impact the student's ability to access regular print materials, textbooks, workbook pages, and other near vision activities (i.e. computer, hand puppets, food). Functional activities for this assessment area may include: describing objects in color pictures, completing puzzles, and reading prepackage food cartons.

Include a formal near acuity screening (symbol charts, paragraph charts, and/or letter charts) to act as a comparison to the clinical measure.

Birth - 3 Years

  • Formal near measures are assessed as appropriate
  • Functional near measures are assessed using familiar objects in the natural environment and address the following areas:
    • Distance
    • Color
    • Contrast
    • Size

3-5 Years

  • Formal near measures are assessed as appropriate for the child
  • Functional near measures are assessed using various objects in all educational/home environments and address the following areas:
    • Object
    • Distance
    • Color
    • Contrast
    • Size

5-22 Years

  • Formal near measures are assessed using standardized near letter charts and/or continuous text cards
  • Functional near measures are assessed using textbooks and classroom materials and address the following areas:
    • Distance
    • Color
    • Contrast
    • Size

Multiple Disabilities/Deafblind

  • Formal near measures (as appropriate) are assessed using standardized near letter charts and/or continuous text cards
  • Functional near measures are assessed using textbooks and classroom materials and address the following areas:
    • Distance
    • Color
    • Contrast
    • Size

Tips

The TVI should record the size and color of the object and distance the child is from the object being viewed. Level of contrast of the object may also be noted (i.e. Johnny first noticed the one inch red block on the black table top from 12 inches).

Typically, near acuity and discrimination is measured at distances within 16 inches.

If the student uses prescribed optical devices, you may wish to assess visual acuity with and without those devices.

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