[visionlist] Focal distance / accommodation distance HTC Vive Pro

[Martin S. BANKS]

We measured it recently. And came up with an estimated focal distance of 65cm.

Marty Banks

> On Oct 11, 2021, at 8:31 AM, Maarten Wijntjes - IO <M.W.A.Wijntjes at tudelft.nl> wrote:
> 
> Dear Daniel,
> 
> Shouldn’t it be in the range of some cm’s as it projects the screen in front of the eyes to far away/infinity? I thought a simple test for focal distance measurement is to project something with it that is far away, e.g. a lamp on a high ceiling or a window. The distance between the lens and the projection plane (e.g. table with white paper) is the focal distance. 
> 
> I hope I am right and did not make an optical fool of myself in front of the vision list community ;)
> 
> Maarten Wijntjes
> 
> 
> 
>> On 11 Oct 2021, at 13:50, Oberfeld-Twistel, Daniel <oberfeld at uni-mainz.de <mailto:oberfeld at uni-mainz.de>> wrote:
>> 
>> Dear list,
>>  
>> we’d like to determine the focal distance in the HTC Vive Pro headset, in order to use exactly this distance for tests of visual acuity before the actual VR experiment. An internet search produced a variation of estimates, ranging from 0.75 m to 2 m or even infinity. So we are wondering if someone here made optical measurements of the Fresnel lenses inside the Vive, to determine the effective focal distance of the display.
>>  
>> Best
>>  
>> Daniel
>>  
>> ---------------------------------
>> Prof. Dr. Daniel Oberfeld-Twistel
>> Johannes Gutenberg - Universitaet Mainz, Experimental Psychology &
>> Laboratoire ICube UMR7357 Université de Strasbourg
>> Wallstrasse 3
>> 55122 Mainz
>> Germany
>>  
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