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Visual Adjustment Features

AllAccessible's 13 visual adjustment features help people with vision impairments, light sensitivity, and color perception difficulties see website co

Written by Frank

Visual Adjustment Features

Overview

AllAccessible's 13 visual adjustment features help people with vision impairments, light sensitivity, and color perception difficulties see website content clearly. From high contrast modes to color blindness filters, these tools adapt visual presentation to individual needs.

Who This Is For

  • People with low vision or partial blindness

  • Users with color blindness (8% of men, 0.5% of women)

  • People with light sensitivity

  • Anyone preferring different color schemes

What You'll Learn

  • All visual adjustment features

  • How contrast modes work

  • Color blindness filters explained

  • Choosing the right visual settings

Contrast and Color Modes

High Contrast Mode

What it does: Dramatically increases contrast between text and background

How it helps:

  • Low vision: Makes text more visible

  • Bright environments: Easier reading in sunlight

  • Aging eyes: Compensates for reduced contrast sensitivity

Technical:

  • Ensures 7:1 contrast ratio minimum (WCAG AAA)

  • Applies to all text on page

  • Preserves or enhances color boundaries

Who needs this:

  • 285 million people worldwide with low vision

  • 1 in 3 people over age 65

  • Anyone struggling to read low-contrast text

📷 High contrast mode comparison

Dark Contrast Mode

What it does: Dark background with light text across entire website

How it helps:

  • Light sensitivity (photophobia): Reduces eye strain

  • Night browsing: Easier on eyes in low light

  • Migraine sufferers: Less triggering than bright screens

  • Screen fatigue: Reduced blue light exposure

Visual Effect:

  • Background: Black or very dark gray (#000000 - #1a1a1a)

  • Text: White or light gray (#ffffff - #f0f0f0)

  • Links: Light blue or cyan for visibility

  • Images: Optional inversion

Research:

  • 50-90% reduction in blue light

  • 30-40% less eye strain (user reported)

  • Preferred by 63% of users in low-light conditions

Similar To:

  • MacOS "Dark Mode"

  • Windows "Dark Theme"

  • Browser dark modes

Difference: AllAccessible applies to ANY website, not just those with dark themes

📷 Dark contrast mode on website

Light Contrast Mode

What it does: Bright background with enhanced dark text contrast

How it helps:

  • Bright environments: Outdoor or office use

  • Opposite preference from dark mode users

  • Maximum readability: High contrast in light setting

Visual Effect:

  • Background: Pure white (#ffffff)

  • Text: Deep black (#000000)

  • Enhanced borders and separations

  • Crisp, clean appearance

Who prefers this:

  • Users in bright offices

  • Outdoor device users

  • Anyone finding dark mode hard to read

Invert Colors

What it does: Reverse all colors on the webpage

How it helps:

  • Cataracts: Inverted colors easier to perceive

  • Contrast perception issues: Different color combinations work better

  • Personal preference: Some users simply prefer inverted

Visual Effect:

  • Black → White

  • White → Black

  • Red → Cyan

  • Blue → Yellow

  • All colors flip on color wheel

Use Cases:

  • Medical conditions affecting color perception

  • Extreme light sensitivity

  • Unique visual processing needs

Note: Can make images look strange - this is normal behavior

📷 Inverted colors comparison

Monochrome (Grayscale)

What it does: Remove all color, display in black/white/gray

Who it helps:

  • Achromatopsia (complete color blindness): 1 in 30,000 people

  • Distraction reduction: Colors removed

  • Focus on content: No color-based decisions

Visual Effect:

  • All colors become shades of gray

  • Preserved contrast and brightness

  • Clear grayscale range

Secondary Benefits:

  • Faster page processing (some users)

  • Reduces visual complexity

  • Helps focus on text

📷 Monochrome mode

Color Blindness Filters

Understanding Color Blindness

Types and Prevalence:

  • Deuteranopia (green-blind): 6% of males (most common)

  • Protanopia (red-blind): 1% of males

  • Tritanopia (blue-blind): 0.01% of population (rare)

  • Achromatopsia (no color): 1 in 30,000 (very rare)

Total Affected: ~8% of men, ~0.5% of women

Protanopia Filter (Red-Blind)

What it does: Adjusts red/green combinations for red-blind users

Problem Solved:

  • Can't distinguish red from green

  • Traffic lights look same

  • Red error messages invisible

  • "Red = bad, Green = good" interfaces fail

Filter Effect:

  • Shifts reds to more distinguishable shades

  • Enhances contrast between red/green

  • Makes charts and graphs readable

Use Cases:

  • E-commerce (price comparisons often use red/green)

  • Dashboards (status indicators)

  • Forms (error/success messages)

  • Data visualizations

📷 Protanopia filter comparison

Deuteranopia Filter (Green-Blind)

What it does: Adjusts green perception

Problem Solved:

  • Most common color blindness (6% of men!)

  • Red/green confusion

  • Cannot distinguish certain color combinations

  • Green error messages missed

Filter Effect:

  • Shifts greens to more visible hues

  • Increases red/green differentiation

  • Makes nature images more distinct

Critical For:

  • Most color-blind users will have this type

  • Affects readability of most color-coded information

Tritanopia Filter (Blue-Blind)

What it does: Adjusts blue/yellow combinations

Problem Solved:

  • Cannot distinguish blue from yellow

  • Blue and gray look same

  • Violet and red confusion

Filter Effect:

  • Shifts blues and yellows

  • Enhances distinction

  • Makes blue/yellow charts clear

Less Common: Rare type, but critical for affected users

Achromatopsia Filter (Total Color Blindness)

What it does: Optimized grayscale with enhanced contrast

Problem Solved:

  • See no colors at all

  • Only brightness and contrast

  • Need maximum contrast for distinction

Filter Effect:

  • Full grayscale (like Monochrome)

  • Optimized contrast levels

  • Pattern-based differentiation where possible

Support:

  • Combines with high contrast

  • Works with other visual features

Additional Visual Features

Saturation Control

What it does: Adjust color intensity/vibrancy

Range:

  • 0%: Grayscale (no color)

  • 50%: Muted, pastel colors

  • 100%: Original colors (default)

  • 125%: Enhanced colors (not recommended)

Who needs this:

  • Photosensitivity: Bright colors trigger migraines

  • Seizure disorders: Reduced saturation safer

  • Autism: Sensory sensitivity to intense colors

  • Eye strain: Muted colors easier on eyes

Visual Effect:

100% (Original): Vibrant, full colors
50% (Reduced): Pastel, muted colors
0% (Minimum): Complete grayscale

Hide Images

What it does: Remove all images from the page

Who needs this:

  • Cognitive disabilities: Images are distracting

  • Slow internet: Faster page loading

  • Screen reader users: Focus on text content

  • Seizure safe: Remove potentially flashing images

What remains:

  • All text content

  • Page structure

  • Navigation

  • Forms and interactive elements

Alt text: Remains for screen readers

Use Cases:

  • Reading articles (focus on text)

  • Data entry (remove distractions)

  • Slow connections (save bandwidth)

  • Sensitive eyes (reduce visual load)

Stop Animations

What it does: Pause all moving content (GIFs, videos, carousels, parallax)

Who needs this:

  • Photosensitive epilepsy: CRITICAL safety feature

  • Vestibular disorders: Motion causes dizziness/nausea

  • ADHD: Animations are distracting

  • Migraine sufferers: Motion triggers headaches

What gets stopped:

  • Animated GIFs

  • Autoplay videos

  • CSS animations

  • JavaScript animations

  • Parallax scrolling

  • Rotating carousels

WCAG Requirement:

  • Level AAA: Pause, stop, hide moving content

  • Level A: No flashing >3 times per second

IMPORTANT: This feature can prevent seizures!

📷 Stopped animations indicator

How Visual Features Work

Technical Implementation

CSS Filters:

/* Dark Contrast */
body {
  filter: invert(1) hue-rotate(180deg);
  background-color: #000;
  color: #fff;
}/* Color Blindness Filters */
html {
  filter: url('#deuteranopia-filter');
}/* Grayscale */
body {
  filter: grayscale(100%);
}

JavaScript:

  • Detects animations and stops them

  • Manages feature state

  • Combines multiple filters

  • Optimizes performance

Choosing the Right Visual Settings

Decision Tree

If you have low vision:
→ Try: High Contrast or Dark Contrast + Text Size increase

If you have color blindness:
→ Try: Your specific filter (Protanopia, Deuteranopia, Tritanopia)

If colors are too intense:
→ Try: Saturation Control (reduce to 50-70%)

If you're light sensitive:
→ Try: Dark Contrast + Saturation Control

If you have seizures:
→ MUST use: Seizure Safe Profile (includes Stop Animations)

If you prefer dark websites:
→ Try: Dark Contrast mode

Combining Visual Features

Effective Combinations

Maximum Readability:

  • High Contrast

  • Text Size: 150%

  • Readable Font

Sensory Reduction:

  • Dark Contrast

  • Saturation: 50%

  • Hide Images

  • Stop Animations

Color Blindness + Low Vision:

  • Appropriate color blindness filter

  • High Contrast

  • Text Size: 125%

Common Issues and Solutions

Issue: Dark Mode Makes Images Weird

Cause: Images get inverted along with text

Solutions:

  1. Use "Images Preserved" option (if available)

  2. Adjust saturation along with dark mode

  3. Use High Contrast instead

Issue: Color Blindness Filter Doesn't Help

Possible Reasons:

  1. Wrong filter type for your color blindness

  2. Website already accessible

  3. Need different approach

Solutions:

  1. Try each filter to find what helps

  2. Combine with high contrast

  3. Use monochrome if filters don't help

Issue: Too Much Contrast Hurts Eyes

Cause: Some people find extreme contrast painful

Solution:

  1. Use moderate contrast instead

  2. Adjust saturation down

  3. Use dark mode with reduced contrast

Frequently Asked Questions

Q: Can I use multiple visual modes at once?
A: Some can combine (dark mode + saturation), others conflict (dark + light contrast).

Q: Do visual features work on images?
A: Most do (filters apply to images). Hide Images removes them completely.

Q: Will dark mode drain less battery on my device?
A: On OLED screens, yes! Dark pixels use less power.

Q: Can I set different visual modes for different websites?
A: Yes, settings are per-domain. Your preference on Site A doesn't affect Site B.

Q: Which contrast mode is best?
A: Personal preference. Try each and see what's comfortable for you.

Q: Do filters work for all types of color blindness?
A: We provide filters for the 4 main types. Rare types may need custom approaches.

Q: Can I suggest new visual features?
A: Yes! Email [email protected] with feature requests.

Related Articles

Last Updated: October 2025
​Total Visual Features: 13
​Availability: All 13 features in Starter plan ($10/month)
​Most Used: Dark Contrast (31% of users)

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