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   Table of Contents      
REVIEW ARTICLE
Year : 2011  |  Volume : 59  |  Issue : 6  |  Page : 481-485

Pseudophakic monovision is an important surgical approach to being spectacle-free


Department of Ophthalmology, Chinese PLA General Hospital, Beijing, China

Date of Submission10-Jan-2011
Date of Acceptance05-Jun-2011
Date of Web Publication19-Oct-2011

Correspondence Address:
MaoNian Zhang
Department of Ophthalmology, Chinese PLA General Hospital, No 28, Fuxing Road, Beijing 100853
China
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0301-4738.86318

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  Abstract 

There are few studies on pseudophakic monovision even though it is widely applied. We reviewed the published literature on pseudophakic monovision. Surgeons select patients who not only have a strong desire to be free of glasses after surgery, but also fully understand monovision design and its drawbacks. However, other criteria adopted for pseudophakic monovision are very different. Both traditional monovision and cross monovision are used in pseudophakic monovision, and the target binocular anisometropia ranges from -1.0 D to -2.75 D. Postoperative results were acceptable in every study and most patients were satisfied, with vision being improved and presbyopia corrected. Complications were decreased stereopsis, contrast sensitivity, and visual fields, similar to other types of monovision. The term "pseudophakic monovision" should include more than just monocular intraocular lens implantation in two eyes, and further studies are required.

Keywords: Cataract, intraocular lens, monovision, presbyopia, pseudophakic


How to cite this article:
Xiao J, Jiang C, Zhang M. Pseudophakic monovision is an important surgical approach to being spectacle-free. Indian J Ophthalmol 2011;59:481-5

How to cite this URL:
Xiao J, Jiang C, Zhang M. Pseudophakic monovision is an important surgical approach to being spectacle-free. Indian J Ophthalmol [serial online] 2011 [cited 2024 Mar 29];59:481-5. Available from: https://journals.lww.com/ijo/pages/default.aspx/text.asp?2011/59/6/481/86318

Monovision is the adjustment of one eye for near vision and the other for distance vision. Pseudophakic monovision is a type of monovision used in lens surgery (most are cataract surgeries) to correct postoperative presbyopia by programmed refractive error from biometry calculations. We searched Medline, Embase, and Google Scholar for published data on pseudophakic monovision. Extracted data were based on the history, patient selection, design, and postoperative evaluation. When full articles were not available, abstracts were used as a source of information.

With development of modern surgical technology, cataract surgery has become much easier and most patients regain good eyesight after a short recovery time. However, patients desire further improvements, and being spectacle-free is a major goal. [1] Monovision is a frequently used technique, [2] and it is used in patients with pre-presbyopia or presbyopia before refractive surgery in preferred practice patterns (PPPs) as recommended by the American Academy of Ophthalmology (AAO). [3] In recent years, monovision design has been adopted in laser corneal refractive surgery [4],[5],[6] and conductive keratoplasty [7],[8] or diode laser thermal keratoplasty [9] to correct presbyopia. Most patients achieve the desired results. Some cataract surgeons also incorporate monovision design into their clinical practice [10],[11],[12],[13],[14],[15],[16],[17],[18],[19],[20],[21],[22] and improve eyesight as well as achieve the extra benefit of correcting presbyopia. However, although pseudophakic monovision is widely used, there are few reported studies. In this article, we review the published literature on pseudophakic monovision.


  History of Pseudophakic Monovision Top


In previous decades, some cataract surgeons prescribed a low myopia-inducing pseudophakic implant (usually -1.0 D) for one or two eyes of patients who wanted to comfortably see close objects. This practice could be the origin of pseudophakic monovision. Boerner and Thrasher [23] first described monovision design in pseudophakic patients in 1984, but there have been few studies published since that time, even though pseudophakic monovision is widely practiced. A survey in 2003 [10] of the American Society of Cataract and Refractive Surgery (ASCRS) members showed that in the United States, 86% of surgeons preferred monovision or modified monovision, and only 13% preferred an Array or other multifocal intraocular lenses (IOLs). However, in a survey in 2007, [11] monovision or modified monovision was recommended by 61% of ASCRS members, while the ReSTOR multifocal IOL (Alcon) was preferred by 17.5%. A survey in New Zealand in 2004 [11] was similar to that in 2007 in that monovision or modified monovision was preferred by 81%, but in 2007, it decreased to 50%, while multifocal IOL increased to 31%. Although the use of monovision has decreased, it is still a preferred and common surgical approach to spectacle independence.

As mentioned above, studies on pseudophakic monovision are few but its actual clinical practice is common. In 2002, Greenbaum [13] showed that most patients with bilateral eye cataracts or bilateral high ametropia have good results. Handa et al., [14] then described ocular dominance and patient satisfaction after monovision induced by IOL implantation. Chen et al., [15],[17] compared monofocal AcrySof IOL using a "blended monovision" formula with a multifocal array IOL for independence from spectacle after cataract surgery. Shimizu [16] also compared visual function of pseudophakic monovision with multifocal monovision. Ito and Shimuzu [19] compared the reading ability of pseudophakic monovision with refractive multifocal intraocular lenses. They also assessed visual performance in pseudophakic monovision. [18],[20] Finkelman et al., [21] and Marques et al., [22] also evaluated patient satisfaction and visual function after pseudophakic monovision. Marques and Marques [12] and then Hayashi et al., [24] studied the optimal target anisometropia for pseudophakic monovision. Stanojcic et al., [25] compared visual fields of patients with implantation of multifocal IOLs with monofocal IOLs of monovision design. Therefore, there are only a few studies on pseudophakic monovision, although monovision plays an important role in presbyopia correction.


  Patient Selection Top


Because some visual functions, such as stereopsis, contrast sensitivity and visual fields, can be reduced after monovision correction, [2],[26],[27] patient selection is a very important issue in presbyopia surgeries, [28] as well as for pseudophakic monovision. [29] Surgeons often select patients who not only have a strong desire to be free of glasses after surgery, but also fully understand monovision design and its drawbacks. [13],[14],[18],[20],[21],[22]

Ito et al., and Shimizu [18],[19],[20],[29],[30] emphasized patient selection, and strict criteria were used. Their inclusion criteria were patients older than 18 years, a previous cataract surgery in one eye with good uncorrected distance vision in that eye (Snellen visual acuity 20/30 or better), and good visual potential in the phakic eye. Exclusion criteria were: (1) corneal astigmatism greater than 1.50 D; (2) ocular deviation (strabismus, exophoria >10.0 prism diopters); (3) strong ocular dominance; (4) patients over 60 years of age; and (5) small pupil diameter to enhance near vision performance. The hole-in-card test (patients were asked to look at a Landolt C target at 50 cm and at 5 m through a 1-cm hole in the center of a piece of cardboard) was used to determine sighting dominance for distant vision. Hand et al.,[14] studied the relationship between ocular dominance and patient satisfaction with monovision induced by IOL implantation. They stressed the importance of thorough examination of the quantity of ocular dominance for monovision design. They also discussed their balance technique for evaluating the quantity of ocular dominance. [31] Pattern visual evoked cortical potentials are sometimes used to assess the interaction of binocular signals in the visual cortex. Finkelman et al.,[21] and Marques et al.,[22] had less restrictions for selection of patients for pseudophakic monovision; corneal astigmatism greater than 1.0 D was excluded in the study by Finkelman et al., and 1.5 D greater than was excluded in the study by Marques et al. Greenbaum [13] had almost no restrictions for patient selection, except for corneal astigmatism greater than 2.0 D, even including patients who had high ametropia and could not be corrected by Lasik surgery. Handa et al.,[14] stressed the importance of ocular dominance in patient selection.

Currently, little advice has been proposed for selection of patients for monovision by PPPs in refractive surgery, [3] and there are no clearly defined limitations for pseudophakic monovision.


  Monovision Design Top


In monovision design, [2] one eye is corrected for distance vision and the other eye for near vision. In clinical practice, traditional (or conventional) monovision is where the dominant eye is corrected for distance and the nondominant eye is corrected for near vision. The reason for this could be that it is easier to suppress blurred vision in the nondominant eye than in the dominant eye. There is another design called cross monovision, in which the dominant eye is corrected for near vision and the nondominant eye is corrected for distance.

Ito et al., and Shimizu [18],[19],[20],[30] adopted traditional monovision. The dominant eye was corrected to 0 to 0.25D, and the nondominant eye was corrected to -2.00 ± 0.50 D. Shimizu [30] preferred customized monovision (taking into account that the pseudophakic eye exhibits appreciable accommodation based on pupil diameter) with multifocal IOLs and mild monovision (-1.00 to 1.50 D, slight myopia in the nondominant eye with pseudoaccommodation in patients with pupil diameters of < 2.5 mm). They also used hybrid monovision (implantation of a monofocal IOL in the dominant eye and a diffractive multifocal IOL in the nondominant eye) for patients under 60 years from 2009. Greenbaum [13] also used a traditional design, with the dominant eye corrected to emmetropia, and the nondominant eye corrected to -2.75 D. However, Finkelman et al.,[21] and Marques et al.,[22] did not account for eye dominance. In the study by Finkelman et al., just one eye was corrected to stigmatism and the other eye was corrected to -1.0 to -1.5 D. In the study by Marques et al., the first eye was corrected to +0.5 D and the second eye was corrected to -2.0 D. Marques and Marques [12] also used toric IOL in patients with relevant corneal astigmatism. In the study by Hayashi et al.,[24] approximately 1.50 D of anisometropia was thought to be optimal for successful monovision. Leaming's survey of practice styles and preferences of ASCRS members [10] showed that approximately 46% preferred a modified monovision approach (nondominant eye set to the -0.5 to -1.0 range regardless of age) in pseudophakic monovision practice. In a 2007 survey, [11] modified monovision accounted for 37%. A New Zealand survey in 2004 showed that modified monovision was preferred in 62%, and in 2007 it was 50%.

There are no strict criteria set for pseudophakic monovision, and therefore, various designs have been used by different physicians.


  Postoperative Evaluation Top


Both retrospective and prospective studies have shown that most patients achieved the desired results after pseudophakic monovision, similar to monovision practiced in Lasik, conductive keratoplasty (CK) and traditional contact lenses to correct presbyopia.

Boerner and Thrasher [23] performed a retrospective study of the postoperative use of glasses in 100 patients with pseudophakic monovision. The number of patients wearing bifocal glasses preoperatively declined by half postoperatively. A total of 11% of patients wore glasses out of habit, even though their visual acuities subjectively needed no correction after surgery. Greenbaum's study [13] included 120 patients for removal of visually significant cataracts, and 20 patients had correction of high ametropia (+8.00 to -14.00 D). One hundred and twenty-nine patients (92%) achieved 20/30 or better uncorrected distance acuity, J1 or better uncorrected near acuity, or both. One hundred and ten patients (91%) in the cataract group and 19 (95%) in the clear lens group also achieved this level. Patient acceptance was 90% in the cataract group and 100% in the clear lens group. Ito et al.,[18] evaluated 82 patients (age 49-87 years) with pseudophakic monovision, and found that most patients had a binocular uncorrected visual acuity of 0.10 logMAR. Shimizu [30] performed further studies and analyzed the outcomes of conventional monovision (69 patients) or customized monovision (20 patients). He found that the mean refraction in the nondominant eye was -2.20 ± 0.39 D for patients having conventional monovision and it was -1.34 ±0.24 D in the customized monovision group, but there were no significant differences of uncorrected visual acuity between the two groups. The study by Finkelman et al.,[21] evaluated 52 eyes of 26 patients with pseudophakic monovision. Uncorrected distance visual acuity was at least 20/30 in 96% of patients, with 92% achieving N8 (J4) or better uncorrected near acuity. Good stereopsis and contrast sensitivity were maintained. One fourth of the patients were completely independent of spectacles and one patient was totally dependent on spectacles. No patient required IOL exchange or other refractive corrective procedures or better vision at all distances. Marques et al.,[22] prospectively studied 38 patients with pseudophakic monovision. All patients achieved uncorrected distant visual acuity of 20/40 or better and uncorrected near visual acuity of J3 or better, and intermediate visual acuity of J3 in 90%. A total of 97.3% of patients were satisfied or very satisfied with this technique. Marques and Marques [12] combined the pseudophakic monovision technique with toric IOL in patients with relevant corneal astigmatism, and all patients achieved uncorrected distance visual acuity ≥ 20/30 and uncorrected near visual acuity ≥ J2, and none of them required spectacle correction at the sixth postoperative month.


  Other Methods Top


Four studies compared monofocal IOL by monovision design with multifocal IOL. Chen et al.,[15] compared AcrySof monofocal IOL in the mini monovision formula (n = 20) with the Array multifocal IOL (n = 20) for patients wanting glasses independence after cataract surgery. The AcrySof monofocal IOL group showed similar and even slightly better results than the Array multifocal IOL group. However, a further study by Chen et al.,[17] showed that the ReSTOR IOL had a significantly higher proportion of postoperative independence from glasses than AcrySof monofocal IOL in the mini monovision formula. Ito et al.,[19] compared reading ability after bilateral cataract surgery in patients who had pseudophakic monovision achieved by monofocal IOL implantation and patients who had refractive multifocal IOL implantation. The monovision group had better critical character size and reading acuity results. Stanojcic et al.,[25] assessed the difference in binocular visual fields in patients who underwent bilateral cataract surgery with either multifocal (MF; Tecnis ZM900, AMO) IOLs or monofocal IOLs with powers adjusted to give monovision (Akreos AO, Bausch and Lomb). There was no statistically significant difference in the incidence of suboptimal visual field results in these two groups (P=0.662), but visual fields of monovision had various defects. No studies have compared monofocal IOL by monovision design with accommodating IOL.


  Postoperative Complications Top


Some visual functions such as stereopsis, contrast sensitivity, and visual fields can decrease after monovision correction. [2] Pseudophakic monovision has the same problems as monovision induced by Lasik, CK and contact lenses, especially when there is high postoperative anisometropia.

Ito and Shimuzu [18] showed that near stereopsis is slightly decreased compared with almost complete refractive correction, although it remains within the normal range (within 100 seconds of arc). Contrast sensitivity is decreased at high frequencies. The most frequently cited reasons for dissatisfaction were asthenopia and spectacle dependence. In the study by Marques et al., [22] the Titmus test showed a mean 197" of arc with reduction of stereo acuity in 31 patients (total, 38 patients). The study by Finkelman et al., [21] showed the same problems; stereopsis and contrast sensitivity were slightly decreased but they were still within the normal range. Greenbaum's report [13] had little discussion regarding complications of pseudophakic monovision, but the incidence of halos or glare was 20% overall. Handa et al.,[14] found that the reason for unsuccessful pseudophakic monovision was that the reversal thresholds (i.e., exclusive visibility of the nondominant eye crosses over that of the dominant eye) were at high decreasing contrast (20%), or not at all. However, in the successful monovision group, the reversal thresholds were displayed only at low decreasing contrast (80% and 60%).

Although some patients have had some complaints, the rate of satisfaction of surgery results was high in all patients.


  Future Directions Top


There are probably two reasons for the lack of studies on pseudophakic monovision. First, many studies have been carried out on monovision and a series of theories have been proposed. [2] Second, new IOLs [32],[33],[34] such as accommodating IOL and multifocal IOL have attracted more physicians and patients than older methods such as pseudophakic monovision.

However, we believe that further pseudophakic monovision studies are required. The first reason is that binocular vision of pseudophakic monovision is established after surgery of two cataract eyes, which cannot see clearly preoperatively, and this is not the case in nearly normal eyes with Lasik, CK or contact lenses. In addition, the theories of binocular vision development are very complicated, [35],[36] and therefore these theories may need modification. Second, new IOLs still have some drawbacks; [32],[37] for example, accommodating IOLs do not have sufficient accommodating capability, and multifocal IOLs cause glare and halos. Moreover, these new IOLs are more expensive. [32],[38],[39] In developed countries, some patients hesitate when it is comes to financial considerations. In developing countries, new IOLs are far more expensive. Pseudophakic monovision can use common IOLs, and it can be reversed temporarily with contact lenses or glasses if patients are taking long driving trips or if they have difficulty adapting, but when using multifocal IOLs, waxy vision or glare is hard to correct.

The term monovision does not exactly describe two eyes being able to complement each other, but it has a very long history [2] and there is no other term that can replace it. Currently, there is no exact definition for pseudophakic monovision by any organization. Nevertheless, the term pseudophakic monovision should not be restricted to monofocal IOL implantation in two eyes, but instead should include various IOLs such as aspherical IOL, toric IOL, multifocal IOL, accommodating IOL and light-adjustable IOL to complement each other. [12],[39],[40],[41],[42] In addition, visual function after cataract surgery is not merely restored, but can be reconstructed, [35] including binocular visual function, which is very important to pseudophakic monovision.

There are few studies [15],[19],[25] comparing IOL-induced monovision with other methods of presbyopia correction. It is difficult to determine which method is better or which is the best when financial interest is excluded. Basic research on pseudophakic monovision is rare, and only Kawamorita et al.,[43] have investigated the effect of pupil size on visual acuity in pseudophakic monovision. Therefore, further studies on pseudophakic monovision are required.

Finally, a definitive term should have a formal abbreviation, but pseudophakic monovision does not have such an abbreviation. We propose the use of "PPMV" for pseudophakic monovision.

 
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Clinical Ophthalmology. 2023; Volume 17: 3123
[Pubmed] | [DOI]
3 Ocular dominance in cataract surgery: research status and progress
Tingting Song, Xuanchu Duan
Graefe's Archive for Clinical and Experimental Ophthalmology. 2023;
[Pubmed] | [DOI]
4 Comparison of binocular visual quality in six treatment protocols for bilateral cataract surgery with presbyopia correction: a prospective two-center single-blinded cohort study
Qianqian Lan, Fan Xu, Tong Sun, Siming Zeng, Yiyun Liu, Tingting Yang, Yaxin Li, Gang Yao, Baikai Ma, Liyuan Tao, Boping Ma, Xin Xiao, Min Li, Hong Qi
Annals of Medicine. 2023; 55(2)
[Pubmed] | [DOI]
5 Ten-year outcomes of pseudophakic mini-monovision correction of hyperopic presbyopia
Dominika Wróbel-Dudzinska, Nuno Moura-Coelho, Francisco Palma-Carvajal, Abdulah Zebdeh, Felicidad Manero, José Luis Güell
Journal of Cataract and Refractive Surgery. 2023; 49(4): 367
[Pubmed] | [DOI]
6 Premium Monovision versus Bilateral Myopic Monovision, Hybrid Monovision and Bilateral Trifocal Implantation: A Comparative Study
Georgios Labiris, Eirini-Kanella Panagiotopoulou, Asli Perente, Panagiota Ntonti, Konstantinos Delibasis, Ioannis Fotiadis, Aristeidis Konstantinidis, Doukas Dardabounis
Clinical Ophthalmology. 2022; Volume 16: 619
[Pubmed] | [DOI]
7 Visual and Refractive Outcomes and Patient Satisfaction Following Implantation of Monofocal IOL in One Eye and ERV IOL in the Contralateral Eye with Mini-Monovision
Sheetal Brar, Sri Ganesh, Raghavender Reddy Arra, Smith Snehal Sute
Clinical Ophthalmology. 2021; Volume 15: 1839
[Pubmed] | [DOI]
8 Cataract surgery in Kinshasa—Is there a place for “Monovision”?
Thomas Stahnke, Edith Mukwanseke, Ngoy J. Kilangalanga, Adrian Hopkins, Oliver Stachs, Rudolf F. Guthoff
International Journal of Clinical Practice. 2020; 74(10)
[Pubmed] | [DOI]
9 Contact lenses, the reverse Pulfrich effect, and anti-Pulfrich monovision corrections
Victor Rodriguez-Lopez, Carlos Dorronsoro, Johannes Burge
Scientific Reports. 2020; 10(1)
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10 Cataract
Dennis Lam, Srinivas K. Rao, Vineet Ratra, Yizhi Liu, Paul Mitchell, Jonathan King, Marie-José Tassignon, Jost Jonas, Chi P. Pang, David F. Chang
Nature Reviews Disease Primers. 2015; 1(1)
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11 Comparison of conventional versus crossed monovision in pseudophakia
J. Kim,H. J. Shin,H. C. Kim,K. C. Shin
British Journal of Ophthalmology. 2015; 99(3): 391
[Pubmed] | [DOI]
12 Binocular Visual Function of Modified Pseudophakic Monovision
Ken Hayashi,Soichiro Ogawa,Shin-Ichi Manabe,Koichi Yoshimura
American Journal of Ophthalmology. 2014;
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13 Further assessment of visual results with accommodating intraocular lenses versus mini-monovision
Jianhe Xiao,Shiyang Li,Caihui Jiang
Journal of Cataract & Refractive Surgery. 2013; 39(5): 816
[Pubmed] | [DOI]
14 Randomized Trial of Multifocal Intraocular Lenses versus Monovision after Bilateral Cataract Surgery
Mark R. Wilkins,Bruce D. Allan,Gary S. Rubin,Oliver Findl,Emma J. Hollick,Catey Bunce,Wen Xing
Ophthalmology. 2013; 120(12): 2449
[Pubmed] | [DOI]
15 Feasibility of multifocal intra-ocular lens exchange and conversion to the bag-in-the-lens implantation
Marie-José Tassignon,Ellen Bartholomeeusen,Jos J. Rozema,Sien Jongenelen,Danny G. P. Mathysen
Acta Ophthalmologica. 2013; : no
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Abstract
History of Pseud...
Patient Selection
Monovision Design
Postoperative Ev...
Other Methods
Postoperative Co...
Future Directions
References

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