Better vision - occupational lenses for artists

Have you ever heard of occupational lenses for near and intermediate vision?

I learned something new when I visited my optician yesterday to get new prescriptions for intermediate and reading distances following my eye surgery (see Normal vision will be resumed as soon as possible). 

 I commented that I'd been thinking of having a pair of bifocals for computer and reading vision - but wanted to wait to see how I got on with my new computer glasses for occasional reading.

Occupational lenses

The optician told me that if I did a lot of reading at the same time as computer work I might be better off having some specific occupational lenses.  (Interestingly this is a topic which has not yet found its way onto Wikipedia!)

She told me that these are typically used by people who work with different and relatively short distances in their immediate workplace - basically any working situation where the emphasis needs to be very much on the whole of their near and intermediate vision.

People who benefit are crafts people like watchmakers, jewellers where the near sight can then be magnified to the level required for the precision and details required and the intermediate used for their vision of their workbench.

Occupational lenses are also commonly used by office workers whose working day is dominated by having to read (looking down - near) and use a computer screen (intermediate) at the same time.  Some of these are bifocals and others are varifocals.

It struck me that this is a solution for the many artists who work in a studio with repeated use of similar distances - such as the botanical artist working from life (ie why I was asking!)

I found this blog post Glasses for the office by Neil Dixon (stuph...) to be very useful to understanding how they work.  It's by somebody who had occupational lenses prescribed for the office but found them particularly beneficial for his leatherwork as well.  His diagram is very helpful.

Diagram by Neil Dixon which contrast regular varifocals with occupational varifocals

What they mean is much less bobbing or tilting of the head to find the best part of your lens to focus on what you're looking at.  

I found regular varifocals to be unsatisfactory for computer vision and opted for single vision lenses - however a much bigger intermediate area for screen / easel distance would seem likely to make a big difference to how useful they would be.

Enhanced near vision lenses

It's also possible to have glasses made with enhanced near vision lenses - with magnification to a specific distance.  This struck me as a much more straightforward solution for miniature artists than wearing the head magnifiers - particularly as the lenses in glasses can then be adjusted for any other optical quirk your eyes might have.  Prescription lenses would then reduce the scope for headaches. I know some artists have obtained these type of lenses as they've found them much easier to use than a freestanding or headband magnifier.

Assessing what sort of lenses are best - the visual task analysis

Unlike normal glasses where the optician is testing your ability to see letters and definition, the nature of occupational lenses means that the opticians needs to know a quite bit more about the nature of your workplace.

The following is an abbreviated extract from Occupational Dispensing - a detailed guide for dispensing opticians.  It highlights the sort of issues a dispensing optician needs to consider.

Visual task analysis
Before spectacles can be dispensed for occupational reasons, it is important to first conduct a visual task analysis to determine the patient’s specific needs. The primary details that need to be elicited are:

• Task size – consider the size of the text/task and the field of view;

• Working distance (WD) – this will dictate the power of the near addition and the range of distances which need to be catered for. 

• Lighting – accurate perception needs optimum lighting, especially when reading, writing, driving and using a VDU. 

• Contrast – black writing on a white background gives the best contrast so consider the patient’s tasks as to whether there will be difficulty in seeing objects in the work area; 

• Colour vision – this is imperative in some occupations so lenses prescribed must be of a suitable material in order to maintain the quality of colour perception and not induce chromatic aberrations.

• Stereopsis – the ability to judge depth is vital in certain occupations 

• Whether the task is still or moving

• The position of the patient and the task – the occupation may involve moving around the working environment and so the lens dispensed ideally should cater for this or at least not cause inadvertent increased risk of injury. 

• Possibility of hazard - the dispenses lenses must provide adequate protection

My tip

Take the guesswork out of a consultation with your dispensing optician and provide facts! A very good way of giving the optician the sort of information they need is to:

• Take a few photos of where you sit/stand and where you work - to show the nature of the set-up in your immediate working environment
• Record measurements relating to the typical distances between your eyes and things you need to see clearly.  Get a long ruler or somebody to help out with the measuring.
• Do some diagrams which show your normal set-up and the distances involved.

More information about occupational lenses

Here are some links to websites which provide more information about occupational lenses.  This is by no means an index of best articles. I'm also NOT recommending the lenses identified so much as recommending the articles as a way of understanding more about how such lenses can help artists and the options on offer.  Your best way forward if you think this is something you'd like to know more about is to have a detailed discussion with your optician.

• Occupational Dispensing - a detailed guide for dispensing opticians
• IPC Office - the best lens for office work
• Occupational Lenses - how they work
• What are occupational lenses
• Standard and modified occupational multifocal lenses
• Nikon - The perfect enhanced intermediate vision lens for home and office - focuses on enheanced near vision lens and has a good diagram of the way different types of lenses work
• Neil Dixon - Glasses for the office 

Normal vision will be resumed as soon as possible

Self portrait sketch 3 May 2013
The day after left phacoelmulsification of cataract with intraocular lens implantation
to illustrate what I look like on the other side of your computer screen!

I'm going to be pacing myself re use of the computer over the next few days following successful eye surgery yesterday.

The surgery yesterday at Moorfields Hospital was to give me a new lens in my left eye.  This is the first half of a plan to resolve two problems with my eyes - cataracts and near acute narrow angle glaucoma.  The good news is my optic nerve is OK and has not been damaged by the latter.

For those who aren't squeamish this is what phacoelmulsification involves!

Thing is - I have to wear an eye shield for 24 hours (and then every night for two weeks) and the glasses for seeing the screen don't fit over the eye shield unless worn at a jaunty angle of about 45%.  Plus I have to point my nose in the air and look down!  It seemed a good idea to record this for posterity!

So I now have four weeks of regular eye drops - and today is when I learn how to do them for myself.  Thank you so much for all those who wrote with tips following my Facebook appeal.  The "closed eyes, plop the drop in the corner and let it roll in when I open my eye" technique works fine!

For the next three weeks I have one eye which matches the prescription lenses in my glasses and one which doesn't - which is going to take some working out!  I hear some people have a lens removed from their glasses.  Any tips for how other artists / computer users have coped with this would be appreciated.

However in three weeks time on 23 May the right eye will be operated on as well.  Then I'll have two eyes which don't match my reading / computer glasses for six weeks!

Finally, at the beginning of July I can go and get prescriptions for new lenses for glasses for reading.  My distance vision should be absolutely fine and not require lenses

I am so looking forward to being able to:

• read exhibition labels without having to zero in close to the label!
• see tone and colour properly again
• read small print without magnifying glasses
• not have double vision any more without glasses
• drive at night and in poor visibility again  - and without the starburst effect from all the headlights

For more about artists with eye problems and other disabilities - and how this all came about for me see MAKING A MARK: Artists overcoming disabilities 25 Feb 2013

UPDATE

The Good News:
Eye shield now off and it's as if a film or veil has been lifted. Colours are better and everything is crystal clear and sharp.  The contrast is back and I can now read the titles of books which are across the room, whereas if I close the eye that's been done and look just with my right I can't even make out where the title is on the spine. Plus  I can read a book with my current reading glasses.

The Bad News:
I can't see the screen with either reading glasses or distance glasses and I recently broke my computer glasses.  Which means in order to work on the computer I have to put a patch over my left eye.  So I now need a proper eye patch so that I don't have to keep using dressings and difficult to get hold of tape for my hypoallergenic needs (Blenderm Surgical Tape if you're interested).  Maybe an eye patch and an inflatable parrot......