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Sight-Sim

Sight-Sim

Sight-Sim is a computing programme that lets you see how different things look like for people with reduced clarity of vision (visual acuity), with reduced contrast sensitivity or with both.

Knowing the measurements of the person with reduced visual acuity and/or contrast sensitivity you can import any image or photo, apply these measurements to the programme, and change the image to make it look the same as they see it.

How do you imagine you look to them? If your child is affected, what do you think they see when they look at you? Well, take a photo, upload it, add the measurements and find out!

Sight-Sim was made by a team of Scientists, Engineers, Computer Programmers and Ophthalmologists in Glasgow. It is world leading and award winning software which has also inspired Peek Vision's smart phone apps. And...it's FREE!

There is one major issue when editing images this way...

Screen sizes vary, and the simulations, to be accurate, need to calculate this.Screen sizes vary, and the simulations, to be accurate, need to calculate this.

...screen sizes vary, so the programme needs a way to simulate the image correctly in respect to the screen you are using. It does this by you using a credit card (or similar card of the same size) as the measurement for calibration.

Part of the set-up process requires you to place a credit card (or similar sized card) on the screen and double click - this way the programme can configure the simulation to the screen size, otherwise it would not be accurate.Part of the set-up process requires you to place a credit card (or similar sized card) on the screen and double click - this way the programme can configure the simulation to the screen size, otherwise it would not be accurate.

This way the programme can configure the simulation to be accurate in relation to the screen you are using.

We've found that a few people have difficulty setting up the software on their computer, so we've written a companion page Sight-Sim Instructions to help.

Sight-Sim Website inc Free Download Links.

Sight-Sim Examples

We have altered some images of a woman (below) to show you the differences reduced visual acuity, reduced contrast sensitivity or both, make to how clearly things are seen.

If you support someone with reduced visual acuity or reduced contrast sensitivity, think about what they see during every moment of their day, for example...

  • Their bedroom
  • Clothes / closet / drawers
  • Bathroom / Mirror (how do they see themselves?)
  • Kitchen / Food / Cupboards
  • Street
  • Car / Bus (approaching and inside)
  • Classroom / Workplace
  • School work, e.g. books used, diagrams, maths sheets etc

How does what they see look different to from us? Is it clear enough to make sense? If not, change it. Make it visible by making things larger, by getting closer and by increasing the contrast. Use this software to check.

You can now find out what is not seen and cannot be learned from, and sort it!

Example: Woman

The measurements are noted under each image. There are many further demonstration examples on the Sight-Sim website.

How do you imagine you look to someone with reduced visual acuity or reduced contrast sensitivity, or both?  Do you know?  How different is it from how you see yourself?How do you imagine you look to someone with reduced visual acuity or reduced contrast sensitivity, or both? Do you know? How different is it from how you see yourself?

If their reduced visual acuity was 6/24 (20/80 or 0.6 logMAR), this is how you would look as different from the first image.  Not quite so clear.If their reduced visual acuity was 6/24 (20/80 or 0.6 logMAR), this is how you would look as different from the first image. Not quite so clear.

Reduced visual acuity 6/60 (20/240 or 1.0 logMAR), maybe a little harder to recognise.Reduced visual acuity 6/60 (20/240 or 1.0 logMAR), maybe a little harder to recognise.

With 6/120 (20/480 or 2.0 logMAR), very little of the face is recognisableWith 6/120 (20/480 or 2.0 logMAR), very little of the face is recognisable

6/240 - are you still recognisable as a person?6/240 - are you still recognisable as a person?

What about with reduced contrast sensitivity?

Slightly reduced contrast sensitivity (63%) and you are still very clear.Slightly reduced contrast sensitivity (63%) and you are still very clear.

At a reduced contrast sensitivity of 32% still may still seem clear, but is quite different from the original image.At a reduced contrast sensitivity of 32% still may still seem clear, but is quite different from the original image.

A 16% contrast sensitivity makes quite a difference.A 16% contrast sensitivity makes quite a difference.

What about both reduced visual acuity and contrast sensitivity?

The left image is 6/60 visual acuity, the right image is 6/60 with 45% contrast sensitivity. Many children with CVI have combined reduced visual acuities and reduced contrast sensitivities.

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At CVI Scotland we are devoted to helping people understand cerebral visual impairments, and together working towards developing the understanding of this complex condition.