Article Date: 8/1/2013

Spectacle Wearers Need to Know More About Contact Lenses
PATIENT VIEWS OF CL ADVANTAGES

Spectacle Wearers Need to Know More About Contact Lenses

An analysis of the perceptions that patients have about the relative advantages of contact lens wear.

Charles W. McMonnies, MSc

images

Charles W. McMonnies is an adjunct professor, School of Optometry and Vision Science, University of New South Wales. He has written three books, five text book chapters, and over 120 scientific and clinical papers. He is a recipient of the Joseph Lederer Award and the British Contact Lens Association Medal in recognition of his contributions to contact lens education and research.

For many patients, the decision to be fitted with contact lenses is made on the basis of wanting to be able to see without wearing glasses. Anecdotal evidence suggests that the decision is usually cosmetically based—wanting to get married and be photographed without glasses, for example. Women in particular, but men as well, may have been exposed to negative messages regarding spectacle wear (Sherrow, 2001).

Movies and television typically have characters undergo character transformation from a stereotypically less attractive persona to one that is more appealing by removing their spectacles—think of the bookish girl in a teen movie or Superman’s timid alter ego Clark Kent, who both take on more compelling personalities the moment that they take off their glasses. The girl becomes very popular with boys who had previously ignored her, and Superman’s image soars when he saves someone, or the entire world, with his x-ray vision.

Other reasons for switching to contact lenses may be unrelated to cosmesis—playing sports or performing in the theatre without the need for glasses are two typical instances.

There are numerous visual and other practical, non-cosmetic advantages to contact lens wear (Table 1), but it’s unlikely that spectacle wearers will know most of them. Many of those benefits cannot be properly anticipated or fully appreciated without actually wearing contact lenses in a variety of circumstances. Once contact lens wear has started, occasional use of glasses helps demonstrate their limitations.

However, other factors can contribute to the decision of whether or not to be fitted with contact lenses. Initial and ongoing costs as well as perceived difficulties with their application and/or care may be important issues. Those pros and cons are relative to the pros and cons for and against spectacle use. Ultimately, a rational comparison can be made only after a comprehensive assessment of an individual’s suitability for contact lens wear has been made—once you’ve fitted an individual with diagnostic contact lenses and explained matters such as the relevant fees, need for aftercare, and any pertinent limitations. Many people become long-term wearers when experience allows them to confirm anticipated benefits and to become increasingly aware of unanticipated advantages of this form of vision correction.

The confidence and enthusiasm with which recommendations are made by a contact lens wearer or a practitioner are big factors in helping people to make a decision to proceed. New wearers are often very enthusiastic about their success, and this energy can be put to good use. The collective advantages for wearing contact lenses may be a more persuasive factor than the individual advantages taken by themselves (some or many will not be applicable to all wearers). Possible disincentives such as affordability become less of an issue if enough potential benefits are anticipated and then realized once contact lenses are worn.

Expectancy Theory

Expectancy theory is one of a class of theories based on the principle of expected value. This principle suggests that people make choices based on the expected payoff of the alternatives (Mitchell, 1979).

Expectancy theory does not distinguish between extrinsic (unessential or extraneous) rewards and intrinsic (inherent) rewards in determining the valence or value arising from performing a particular behavior. It assumes that they simply are cumulative, so that there is a greater likelihood of performing a behavior that has both intrinsic and extrinsic rewards, other things being equal (Long, 1998). For example, some advantages of contact lenses may not be relevant to a patient because they are specific to a particular age, activity, or class of wearer.

Table 1. Contact Lens Advantages in Order of Their Unawareness by Lens Wearers

1. Some nearsightedness can be corrected by contact lenses during sleep so that they are not needed during the day.....78%

2. Some types of contact lenses can help reduce increases in nearsightedness.....74%

3. Contact lenses can be used to bandage eyes that have been injured and need protection.....74%

4. Contact lenses can deliver medication to eyes requiring treatment.....70%

5. Special contact lenses can improve some types of abnormal color vision.....65%

6. Irregular astigmatism can only be corrected with contact lenses, enabling a better quality of life.....61%

7. For nearsighted people, vision may be better because images are larger with contact lenses.....57%

8. Soft contact lenses reduce irritation from cigarette smoke.....57%

9. Optical and vision advantages increase for higher prescriptions.....48%

10. Some contact lenses can provide protection from dangerous ultra violet (UV) radiation, especially when sunglasses can’t b worn.....48%

11. When eyes require different powers, contact lenses balance the image sizes. The better balance can improve the way the eyes work together and work as a team to provide better vision.....43%

12. Your field of view is reduced by spectacle frames and lenses. The wider field of view in contact lenses makes driving safer, for example.....35%

13. Contact lenses offer protection from stinging when cutting up onions.....35%

14. Contact lenses help protect eyes from flying particles and dust.....35%

15. Farsighted correction with contact lenses improves vision for applying makeup.....30%

16. Cosmetic contact lenses can help normalize the appearance of unusual looking eyes.....26%

17. People who work in a hospital or scientific laboratory, for example, find it easier to use a microscope when wearing contact lenses.....26%

18. Kissing in contact lenses is more passionate than in spectacles, which can be a real distraction.....22%

19. Wearing special aids to enable 3D viewing of movies is easier when wearing contact lenses.....22%

20. From their head-down position through sunglasses, cyclists riding racing bikes find that contact lenses give them clearer vision.....22%

21. Photography is easier because the view through a camera is much better in contact lenses.....22%

22. Vision does not change when you look up, down, or to the side in contact lenses because they always move with your eyes so that your best focus always stays in front of your pupil.....22%

23. Conversations, teaching, performing, or any other face-to-face situation are all more natural without the barrier of spectacles.....17%

24. Spectacle lenses can be very thick and make your eyes look larger or smaller than normal.....13%

25. SCUBA diving and snorkeling are much better with a face mask worn over contact lenses.....13%

26. Contact lenses coordinate with your entire wardrobe of clothing options.....9%

27. Water skiing is much safer in contact lenses due to the clearer, splatter-free vision provided.....9%

28. Apart from the cosmetic advantages of looking better without spectacles, colored contact lenses can provide the option of a desirable variation in eye color.....9%

29. Photographs of spectacle wearers can be impacted by eyes hidden by reflections and/or shadows.....9%

30. Being able to read and see distance without wearing spectacles is a big advantage.....9%

31. Confidence and self-esteem are often elevated by switching to contact lenses, especially in children.....4%

32. Wearing ski goggles is much easier when wearing contact lenses.....4%

33. In many work situations requiring eye protection, contact lenses are superior. They fit more easily than spectacles do under protective goggles or welding masks, and they protect the eyes from flying particles.....4%

34. Eye makeup looks better with contact lenses because the effects created are not hidden by spectacle lenses and frames.....4%

35. Contact lenses are great for sailing or just being near the sea, whereas sea spray can be a problem with spectacles.....4%

36. Just a few rain drops on spectacle lenses can be a problem for vision. Contact lenses have lid wipers to keep vision clear when it is raining.....4%

37. Spectacle frames can easily slip when you jog, run, or just bend forward to pick something up.....4%

38. Contact lenses are safer for playing with young children, who can easily dislodge spectacles.....2%

39. Spectacles can get foggy in the kitchen.....2%

40. Fashion sunglasses can be worn over contact lenses for a better look compared to prescription sunglasses.....1%

41. Spectacles are a big problem in many sports, especially when body contact is involved. Better side vision with contact lenses, for example, can be a great asset in all sports.....0%

42. Spectacle frames slip down your nose or leave marks on your nose and your ears.....0%

43. Spectacle lenses can fog up, especially in winter and when playing sports.....0%

44. Perspiration makes it easier for frames to slip down your nose in hot weather.....0%

However, awareness of such factors may nevertheless combine with advantages that are relevant to that patient to help him make a decision to proceed with a fitting. The algebraic sum of the ‘for’ and ‘against’ factors is the decision maker, with the pros and cons being weighted according to personal preferences and needs. For instance, visual acuity for highly hyperopic patients is not the only criterion for preferring contact lenses over spectacles; this is confirmed by the continued use of contact lenses by some patients when visual acuity is actually better when they wear glasses. Apparently, advantages such as a wider field of view and avoiding the over-large eye appearance created by spectacles combine to outweigh the acuity loss.

Desire to have something can increase with the number of people who already have it (Mitchell, 1979). Market statistics reveal that there were 130 million contact lens wearers worldwide in 2011 (Morgan et al, 2012). Although 130 million is a significant number, it is only a small percentage of the estimated one billion myopes in the world (Norton et al, 2005). Contact lenses are impractical for many potential wearers for reasons that may include their cost and/or living in conditions or climates that are counter to successful contact lens use. In addition, there may be poor access to contact lens practitioners, and for too many people there is no access to any form of eye care (Holden, 2007; Woo and Woo, 2013).

Yet in Australia, where contact lenses are more affordable compared to many other countries, only 5.1 percent of the population wore contact lens in 2009 (Edwards et al, 2009). This is a low rate compared to countries such as Japan, the United States, New Zealand, and England (Morgan et al, 2011). In urban and rural populations in the Australian state of Victoria in 1999, the prevalence of myopia greater than –0.50D was 17 percent (Wensor et al, 1999). Myopia has been steadily increasing in prevalence (Wensor et al, 1999) (Rose et al, 2001), and a higher prevalence would be expected now. Considering the increased prevalence of myopia since the 1998 finding of 17 percent, as well as indications for contact lenses other than to correct myopia, the 5.1 percent usage among Australians reported in 2009 (Wensor, 1999) is only about one quarter of the expected potential for contact lens use.

Reduced fitting rates may result from many other factors including low recommendation levels by practitioners and limited awareness of the potential vision and other advantages provided by contact lens wear.

Addressing the Unmet Potential

Unfortunately, contact lens wearers often do not transmit positive messages about wearing contact lenses because they are not readily identifiable as successful contact lens wearers. Unless they are remembered as spectacle wearers, they appear in contact lenses to be free of the need for any vision correction at all. Ideally, they would wear a badge or T-shirt proclaiming, “I am a very happy contact lens wearer.” However, this would conflict with any desire to keep contact lens wear a private matter.

In contrast, a negative message related to contact lens use can be disseminated when, for example, a character in a film is obliged to portray the cliched moment of being inconvenienced by losing a contact lens or being irritated by contact lenses.

It appears that there is a large unmet potential for contact lens use by spectacle wearers whose knowledge of their many advantages is likely to be limited. Awareness of the wide range of potential advantages that contact lenses offer over spectacles can be increased using a list of those advantages titled “Why millions of people love wearing contact lenses,” (McMonnies, 2011). This study examines the potential of such a list of advantages as a means of informing and educating spectacle wearers of the wide range of prospective advantages of contact lens correction.

Expanding Awareness

However, it cannot be assumed that existing lens wearers, even those who have extended experience, have an extensive knowledge or appreciation of the many potential advantages of contact lens use. This limited understanding of those advantages may result in a reduced ability and/or willingness to advocate contact lens correction to relatives, friends, acquaintances, and work colleagues. The purpose of this study was to quantify the level of awareness of the advantages of contact lens correction among existing contact lens wearers. This measure may indicate the potential for their increased awareness of those benefits, so that they can better advocate for contact lens wear.

The original version of the list of 33 advantages (McMonnies, 2011) was increased to 44 for this survey with advice from Graeme Young, MPhil, PhD, FCOptom, DCLP, FAAO; Alan Saks, MCOptom, Dip. Optom, FCLS, FAAO; Russell Lowe, BSc Optom, FAAO, and John Boyce, BSc, Dip Opt. Optometrists were asked to submit the survey to current contact lens wearers, asking them to indicate which of the potential advantages of contact lens correction were unknown to them. Participation was voluntary, and all responses were anonymous.

Table 1 indicates the ranking of contact lens advantages according to the percentage of respondents who indicated that they were not aware of them. The three least aware respondents indicated being unaware of 56 percent, 48 percent, and 41 percent of the advantages, compared to the three most aware respondents, who were unaware of only 6 percent, 9 percent, and 9 percent of the advantages. On average, the respondents indicated unawareness of 27 percent of the advantages. Many respondents will not have experienced those benefits because they are too old or too young, have a different type of refractive error, don’t play sports, etc.

This is not a surprising result, but many of these contact lens wearers might be better at recommending contact lens use if they were provided with the list to give to spectacle wearers. Making current contact lens wearers aware of the survey should widen their appreciation of the numerous advantages of contact lens correction. Theoretically, that enhanced appreciation can add to increased motivation and enthusiasm for successful and positive interactions with spectacle wearers.

Copies of the list can be provided to contact lens wearers to support their recommendations when they are speaking to spectacle wearers. A longer list, recently increased to 50 advantages, might even be more likely to impress and motivate spectacle wearers to seriously consider contact lens use—any one of those advantages might be the key to triggering that exploration. Even when cosmetic considerations don’t factor into a decision to consider contact lenses, there are many other advantages that can provide enough motivation. Spectacle wearers need to know about them. CLS

To obtain references for this article, please visit http://www.clspectrum.com/references.asp and click on document #213.



Contact Lens Spectrum, Volume: 28 , Issue: August 2013, page(s): 34 - 36 38