Optical Devices for Near Viewing

By: Carmen Willings
teachingvisuallyimpaired.com
​Updated October 17, 2025
Optical low vision devices use lenses to magnify print and images, making them accessible for students with low vision. These tools support tasks like reading books, menus, labels, and more. All optical devices should be prescribed by a certified Low Vision Specialist based on the student’s unique visual needs. 

Lens Types

Lens Type
Magnification
Key Features
Pros
Cons
Convex Lens
1.5x - 4x
Lightweight, used on either side
Portable, good for quick spotting
Edge distortion, not for extended reading
Bi-Aspheric Lens
1.7x - 20x
Dual curved surfaces, minimal distortion
Edge-to-edge clarity
Requires exact focal distance
Single Aspheric Lens
2.5x - 15x
Flat side on page, curved side up
Stable, distortion-free image
Heavier than other lenses
Flat Field (Dome/Bar)
Varies
Rests on page, always in focus
Easy to use, good light gathering
Not suitable for all tasks or high magnification

Type of Magnifiers 

Hand-Held Magnifiers
  • Use: Reading labels, quick spot reading, menus, books
  • Pros: Portable, familiar, available with or without lighting
  • Cons: Requires steady hand and correct distance; only one hand free
handheld magnifier
handheld magnifier
 Stand-Mounted Magnifiers
  • Use: Sustained reading/writing
  • Pros: Fixed focal distance, may include lighting
  • Cons: Bulky, can cause postural fatigue
visiolux stand magnifier
visiolux stand magnifier
Dome & Globe Magnifiers
  • Use: Reading full lines or blocks of text
  • Pros: Always in focus, no focal distance required
  • Cons: Not available in high powers, must rest on surface
dome magnifier
dome magnifier
Bar Magnifiers
  • Use: Line-by-line reading
  • Pros: Simple, familiar, rests directly on text
  • Cons: Limited magnification (up to 1.5x), may distort edges
bar magnifier
bar magnifier
Pocket Magnifiers
  • Use: On-the-go spot reading (tags, labels, prices)
  • Pros: Compact, available in a range of powers (2x–15x)
  • Cons: Narrow field of view, short working distance
pocket magnifier
pocket magnifier
Spectacle-Mounted Magnifiers
  • Types:
    • Half-Eye Prismatic Spectacles (1x–4x)
    • Hyperoculars (4x–12x)
  • Use: Hands-free reading/writing
  • Pros: Keeps both hands free
  • Cons: Very short working distance, higher magnification limits range
Prismatic Spectacles
Prismatic Spectacles
Magnifiers with Adjustable Arms
  • Note: Often designed for sighted users (e.g., hobby work)
  • Cons: Low magnification, not suitable for most students with visual impairments
Adjustable Arm Magnifier
flex arm magnifier
The question is not what you look at, but what you see."  -Henry David Thoreau

Subscribe today!

Subscribe today to unlock premium resources & printables. Choose the subscription level that best fits your needs and get immediate access to additional printable resources, ECC tools, and more. Subscription plans are individual and non-transferable. Your membership helps sustain and grow this resource for the vision community. ​​Thank you for your support!

Article Pages

VI Basics
History of VI ​Vision Professionals​ ​Professional Publications ​​Program Tools & Templates ​Policy & Advocacy ​​Professional Support AT Resources​
Service Planning
VI Referrals​ ​Medical Vision Exam ​Visual DiagnosisFVLMALow Vision EvaluationsOther Evaluations​Service PlansGoals & Objectives
Consultation
​Unique Visual Needs
​Collaboration​​Instructional Adaptations​Environmental Adaptations​​Material Adaptations​Access ClassesFamily Resources
Teaching Strategies
Compensatory Skills
Concept Development​Alternative Communication​Emergent Literacy​Beginning Braille​​Braille Code​Braille Fluency & Comprehension​Braillewriter​​​​​Slate & Stylus Basics *S
​​​Nemeth Code Instruction *S
​​​Tactile Graphics​Print Concepts​​Abacus ​​Organize​​​Study Skills​​Time Management
Sensory Efficiency
​Auditory Efficiency​​​​​Listening Skills​​Visual Efficiency Skills​​Optical Device Use​Tactile Readiness
Assistive Technology
AT Assessment ​AT Instruction​
AT Basic Use ​​AT Problem Solving ​Braille Notetaker ​iOS/Tablet Instruction Audio Skills ​Video Magnifiers ​​Basic Computer Use Access Productivity
Social Skills
​Non-Verbal Skills​​​​​CommunicateCooperativeIdentity & Self-Awareness​Interactions & RelationshipsManaging Challenges & Safety
Self-Determination
Independent Living Skills
Personal Care ​Hygiene  ​Personal Health Mealtime Skills ​​​ Food Preparation​Household SkillsClothing Management​Money & BudgetShopping & ConsumerismPhone Use​Safety & Emergency Preparedness​​Services & Community Resources
Orientation & Mobility
Recreation & Leisure Skills
Career & Vocational
Interactive Activities
Recorded Presentations
Lesson Planning 
Thematic Units
Beginning of the Year Units ​​Fall Units​​Winter Units​​Spring UnitsHoliday Units
Printable Resources
**Additionally, each Teach Subscription page and each Thematic Unit contains additional unique printables!
*M = free member pages
*S = Basic subscription pages
*CS = Complete set bonus
*A = All Access subscription pages