Why Visual Performance Matters: Foundations for Occupational Therapy Practice

Transition: "Module 2."

Open here. "The Visual Pathways." Ventral "what" vs. dorsal "where," and their classroom signatures.

Say why this section matters for their caseload, then advance.

Ask the poll: "Which visual performance patterns show up most in your current caseload?"

Options:

• Slow recognition of letters, words, or symbols

Talk over the visual: "Two streams, one retina."

Say the caption in your own words: Retina → optic nerve → chiasm → LGN → V1, then divergence: dorsal superiorly to parietal cortex, ventral inferiorly to temporal cortex (Visual Minds Learning clinical education).

Talk over the visual: "Parvocellular and magnocellular tracts."

Say the caption in your own words: Parvocellular cells carry fine detail and color into the ventral stream; magnocellular cells carry motion and low-contrast information into the dorsal stream.

Talk over the visual: "Vision's Two Highways."

Say the caption in your own words: The magnocellular highway (motion, contrast, spatial awareness, action) and the parvocellular highway (detail, color, form, recognition) merge at the LGN before diverging into the dorsal and ventral streams.

Talk over the visual: "Vision's two highways in the school day."

Say the caption in your own words: Ventral "what" signs versus dorsal "where" signs, side by side with the classroom behaviors each one produces.

Contrast the two columns: Ventral stream — "What?" versus Dorsal stream — "Where?".

Ventral stream — "What?":

• Parvocellular tract

Frame the slide: "What a ventral-stream (parvocellular) signature looks like in class."

Walk each point, one sentence each:

• Slow, effortful recognition of letters, sight words, or numerals

Frame the slide: "What a dorsal-stream (magnocellular) signature looks like in class."

Walk each point, one sentence each:

• Bumping into furniture, misjudging distances, poor spatial awareness in the room

Frame the slide: "We do not treat tracts — we treat the functional components."

Walk each point, one sentence each:

• The magnocellular and parvocellular tracts describe transmission: how visual information travels from retina to cortex. That is anatomy and physiology, and it is outside what OT assesses or changes.

Run the five levels bottom-up.

Spend your time on Level 3 — that is the point of this slide.

Set up the clip in one sentence, play it, then debrief with "what did you notice?"

Talk over the visual: "Beyond 20/20 — the Visual Performance System™."

Say the caption in your own words: Level 1 Visual Access → Level 2 Visual Efficiency → Level 3 Visual Processing → Level 4 Visual-Motor Integration → Level 5 Functional Integration.

Read the scenario aloud, slowly:

A 3rd-grade student reads individual words accurately in isolation but cannot find her place after looking up from the page, and she frequently loses items placed directly in front of her on a busy desk.

Then put these questions to the room:

Set up the contrast: "What a spatial ("where") breakdown looks like on the page."

Point at the before panel first. The student has to generate placement, size, and direction with no external structure.

Then the after panel. Same sentence, same student, with baseline and line-to-line reference restored.

Land the "so what": You will almost never be handed a vision complaint. You will be handed avoidance, sloppiness, slowness, or "not trying."

Explain the mechanism plainly: Children rarely report a visual world they have always had. They report what it costs them, in behavior.

Then give them the moves — say each one as something they can do Monday:

Set up the contrast: "Postural setup changes what you are measuring."

Point at the before panel first. Feet unsupported, trunk collapsed, page about 15 cm from the eyes.

Then the after panel. Feet supported, hips back, page raised toward a slant, working distance near Harmon distance.

Two-minute case. Read it aloud:

A Grade 3 student completes math facts on a whiteboard quickly, but produces almost nothing on the same problems given as a dense worksheet.

Put the question to them: "What does that difference tell you, and what do you trial first?" Give 60 seconds, no talking.

Reflection prompt: "Choose one student. Describe one behavior that looks like a "what" problem and one that looks like a "where" problem."

Cues:

• Use only the language of classroom performance, not stream labels.

Knowledge check: "A student reads words accurately but cannot copy from a spatial diagram. Which description fits best?"

Options:

• Ventral stream problem — difficulty identifying details