Using a Smartphone With Low Vision

How to use your smartphone's built-in magnification, text-to-speech, contrast, and voice tools as practical low-vision accessibility aids.

Photo by Andrey Matveev / Unsplash

Using a Smartphone With Low Vision

A smartphone can be one of the most useful low-vision tools you already own. It can enlarge print, read text aloud, improve screen contrast, identify objects and connect you with visual assistance.

You do not need to learn every accessibility feature at once. Start with the task that causes the most difficulty and add one tool at a time.

Choose how you want to use the screen

Most people use one or more of these approaches:

Visual access: Larger text, bold text, screen magnification and customized colors
Spoken access: Text-to-speech or a screen reader
Combined access: Magnification and speech used together

Your preferred method may change with the task. You might enlarge a text message, listen to a long article and use the camera to read a package label.

Begin with text and display settings

A few basic adjustments can make the entire phone easier to use.

On an iPhone

Open Settings → Accessibility to find most vision features.

Useful settings include:

Display & Text Size: Bold Text, Larger Text, Increase Contrast, Reduce Transparency, Smart Invert and Color Filters
Zoom: Magnifies the entire screen or a movable portion of it
VoiceOver: Provides spoken access to controls, text and navigation
Read & Speak: Reads selected text or the entire screen aloud
Magnifier: Uses the camera to enlarge nearby print and objects

Dark Mode is available under Settings → Display & Brightness.

Apple occasionally changes feature names and menu locations. Search within Settings if a listed pathway is different on your phone.

On Android

Open Settings → Accessibility to find the accessibility features available on your device.

Useful settings may include:

Display size and text
Magnification
Color correction
Color inversion
Dark theme
Select to Speak
TalkBack
Reading mode
Extra dim
Lookout

Android menus vary by phone manufacturer and software version. Use the Settings search box to look for a feature by name if you cannot find the expected pathway.

Make text larger without making the phone harder to use

Increase the text size until menus and messages are comfortable to read. Then check several commonly used apps.

Very large text may cause buttons or words to wrap onto additional lines. Some poorly designed apps may not enlarge correctly. If an app becomes difficult to navigate, try a slightly smaller text setting combined with bold text, stronger contrast or screen magnification.

The best setting is not necessarily the largest setting. It is the one that lets you read accurately and move through the screen comfortably.

Understand screen magnification

Screen magnification enlarges information already displayed on the phone. It is different from using the camera to enlarge something in the physical world.

iPhone Zoom

Go to Settings → Accessibility → Zoom.

Zoom can magnify the full screen or show a resizable magnification window. Apple also provides options such as Follow Focus, which can track selected items and the text-entry point.

Because Zoom changes how some gestures work, practice before depending on it for an important task.

Android Magnification

Search for Magnification under Settings → Accessibility.

Depending on the device, magnification may use an onscreen accessibility button, a gesture, a shortcut or the volume keys. Some devices provide both full-screen and partial-screen magnification.

Practice opening, moving and closing magnification while you are somewhere comfortable.

Use the phone as a handheld magnifier

Camera magnification helps with short tasks such as reading:

Product labels
Price tags
Appliance controls
Restaurant menus
Mail
Thermostats
Instructions

iPhone Magnifier

Apple’s Magnifier app can enlarge nearby objects and print. Depending on the iPhone model and software version, it may also adjust brightness and contrast, apply color filters, freeze an image or detect and speak nearby text.

Android options

Some Android phones provide a built-in Magnifier or a manufacturer-specific camera tool. The standard camera can also help with quick enlargement. Google’s Lookout app provides additional spoken visual information on supported devices.

For a steadier image:

Rest your elbows on a table.
Place the item on a stable surface.
Move the phone closer before using excessive digital zoom.
Add even lighting without creating reflections.
Capture or freeze the image before enlarging it.
Use a phone stand for longer tasks.

A smartphone works well for quick viewing, but holding it over a page for an extended period can become tiring.

Safety warning: Camera detection and artificial-intelligence descriptions can be incomplete or wrong. Do not rely on them for street crossing, traffic decisions, medication identification, emergency decisions or navigation where an error could cause injury.

Have printed text read aloud

A smartphone camera can convert printed words into digital text and speech. This is often called optical character recognition, or OCR.

It can help with:

Letters and short documents
Package directions
Menus
Signs
Printed forms
Product information

For better results:

Place the document on a plain, contrasting surface.
Use even lighting.
Hold the camera parallel to the page.
Make sure the entire text area is inside the frame.
Check names, numbers and instructions carefully.

OCR can misread handwriting, decorative fonts, curved containers, glare, damaged print and complex page layouts. Verify important financial, legal, medical and safety information with an authoritative source or another person.

Use spoken access without turning on a full screen reader

You may want occasional speech without changing how the entire phone operates.

On iPhone, Read & Speak can read selected text or screen content aloud. Apple’s Accessibility Reader can also present supported text in a simplified full-screen view with customized fonts, colors and speech.

On Android, Select to Speak can read selected on-screen text. Reading mode can simplify supported webpages and apps, adjust text appearance and read content aloud.

These tools can be easier to learn than a full screen reader if you still use the display visually most of the time.

Use a screen reader when visual access is not enough

A screen reader speaks the controls, text and status information displayed on the phone.

VoiceOver is built into iPhone.
TalkBack is the primary Android screen reader.

A screen reader changes how touchscreen gestures work. For example, tapping an item may select and announce it, while a second action activates it.

Use the built-in tutorial or practice area before enabling a screen reader during an urgent task. An assistive-technology trainer or vision-rehabilitation professional can also help you build efficient gestures and navigation skills.

Create a fast accessibility shortcut

A shortcut prevents you from searching through menus whenever you need magnification or speech.

iPhone

Go to Settings → Accessibility → Accessibility Shortcut. Select the features you want to reach quickly.

You can then triple-click the side button or Home button. Supported iPhones may also use the Action button, Control Center, Back Tap or a spoken shortcut.

Android

Open Settings → Accessibility, choose the desired feature and review its shortcut options.

Depending on the phone, options may include:

An onscreen accessibility button
Holding both volume keys
A finger-swipe gesture
A Quick Settings tile
A magnification gesture

Choose one shortcut you can perform consistently and practice it until it becomes familiar.

Use voice commands for common tasks

Siri, Google Assistant and other voice-control features can reduce the need to locate small controls.

Voice commands may help you:

Make a phone call
Send or dictate a message
Set an alarm or timer
Add a calendar reminder
Open an application
Check the weather
Start navigation
Turn some accessibility features on or off

Review the result before sending dictated messages or saving important information. Speech recognition can misunderstand names, addresses, medication names and numbers.

Be mindful of privacy when speaking personal information where others can hear it.

Explore visual-assistance tools carefully

Visual-assistance applications may use artificial intelligence or a remote person to describe what the camera sees.

Possible tasks include:

Reading short text
Identifying currency
Finding a product
Sorting clothing
Describing a photograph
Reading an appliance display
Locating an item on a shelf

Some services connect users with volunteers, while others provide trained agents through a subscription or sponsored program.

Before showing prescriptions, mail, identification, financial records, work materials or computer screens, review the service’s privacy practices. Images or video may be processed on the device, sent to a remote server or viewed by another person.

Do not assume that an AI-generated description is complete or accurate.

Make digital reading more comfortable

Digital text can be easier to read than print because it can reflow when enlarged.

Try adjusting:

Font size
Font weight
Line spacing
Screen brightness
Background color
Contrast
Reading width
Speech rate

Dark Mode helps some people but reduces readability for others. Color inversion can also change photographs, icons and other visual content. Test several combinations instead of assuming one display mode is universally best.

For long reading sessions, consider text-to-speech or an audiobook. A phone stand may also reduce hand, neck and shoulder fatigue.

Know when a dedicated device may work better

A smartphone is excellent for short, portable tasks. It does not replace every optical or electronic magnifier.

A dedicated video magnifier may be better for:

Reading books for extended periods
Writing or signing documents
Viewing an entire page
Working with both hands
Crafts and hobbies
Tasks requiring a stable camera
Situations where a larger display reduces panning

Choose the tool according to the task rather than assuming one device must do everything.

A simple setup plan

Start with these six steps:

Increase text size and turn on bold text.
Adjust brightness and contrast.
Add Magnifier or magnification to an accessibility shortcut.
Turn on selected-text speech or Reading mode.
Move your most useful accessibility tools to the first Home Screen.
Practice one camera-reading task using an unimportant document.

After those settings feel familiar, consider learning VoiceOver, TalkBack, Lookout, visual-assistance services or more advanced voice control.

Protect your privacy and security

Accessibility should not require giving up basic security.

Use a screen lock you can operate reliably.
Enable biometric access when appropriate.
Review camera, microphone, photo and location permissions.
Download apps from an official application store.
Check subscription terms before starting a free trial.
Avoid scanning sensitive documents with an unfamiliar app.
Keep the phone and accessibility applications updated.
Use headphones when spoken content could reveal private information.
Make sure emergency information can still be reached when the phone is locked.

When to ask for training

Consider individualized assistance if:

Magnification makes it difficult to find your position on the screen.
You want to transition from visual access to a screen reader.
Hand tremor or reduced dexterity makes gestures difficult.
You need the phone for work, education or complex travel.
Several accessibility settings conflict with one another.
You are unsure which applications protect your privacy.

A low-vision rehabilitation professional, occupational therapist or assistive-technology trainer can help configure the phone around your specific tasks.

Trusted setup resources

Educational notice

This guide provides general educational information. Features, compatibility, menu names and subscription terms change over time and may vary by phone, operating-system version, manufacturer, language and region. LowVisionGuide.org does not endorse a particular phone, application or service. Verify current instructions through the device manufacturer and seek individualized training when needed.