Comparison of two laboratory-based systems for evaluation of halos in intraocular lenses

Carson, Dennis; Lee, Sangyeol; Alexander, Elsinore; Wei, Xin; Lee, Shinwook

doi:10.2147/opth.s152201

Cited by 7 publications

(4 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, when the PDF lens was combined with a converging lens, the results showed a definite multifocal function: far objects appeared slightly blurry compared with a monofocal lens. These findings are similar to those using diffractive multifocal IOLs [ 10 – 16 ].…”

Section: Discussionsupporting

confidence: 88%

Development of a novel multifocal lens using a polarization directed flat lens: possible candidate for a multifocal intraocular lens

Lee

Kim

et al. 2021

BMC Ophthalmol

View full text Add to dashboard Cite

Background A polarization-directed flat (PDF) lens acts as a converging lens with a focal length (f) > 0 and a diverging lens with f < 0, depending on the polarization state of the incidental light. To produce a multifocal lens with two focal lengths, a PDF and a converging lens having shorter focal length were combined. In this study, we tested a bifocal PDF to determine its potential as a new multifocal intraocular lens (IOL). Methods Constructed a multifocal lens with a PDF lens (f = +/− 100 mm) and a converging lens (f = + 25 mm). In an optical bench test, we measured the defocus curve to test the multifocal function. The multifocal function and optical quality of the lens in various situations were tested. An Early Treatment Diabetic Retinopathy Study (ETDRS) chart as a near target and a building as a distant target were photographed using a digital single-lens reflex (DSLR) camera. Both lenses (multifocal and monofocal) were tested under the same conditions. Results For the 0 D and − 20 D focal points, the multifocal lens showed sharp images in the optical bench test. In the DSLR test using the multifocal lens, the building appeared slightly blurry compared with the results using the monofocal lens. With the multifocal lens, the ETDRS chart’s images became blurry as the ETDRS chart’s distance decreased, but became very clear again at a certain position. Conclusions We confirmed the multifocal function of the multifocal lens using a PDF lens. This lens can be used as a multifocal IOL in the future.

show abstract

Section: Discussionsupporting

confidence: 88%

Development of a novel multifocal lens using a polarization directed flat lens: possible candidate for a multifocal intraocular lens

Lee

Kim

et al. 2021

BMC Ophthalmol

View full text Add to dashboard Cite

show abstract

“…These ndings are similar to those using diffractive multifocal IOLs. [9][10][11][12][13][14][15] In this study, we used a converging f = 50 mm lens and a PDF lens with f = + /-100 mm. The PDF lens with f = + /-100 mm was commercially available with the longest focal length.…”

Section: Discussionmentioning

confidence: 99%

Development of a novel multifocal lens using a polarization directed flat lens: Possible candidate for a multifocal intraocular lens

Na¹,

Lee²,

Kim³

et al. 2021

Preprint

View full text Add to dashboard Cite

Background: A polarization-directed flat (PDF) lens acts as a converging lens with a focal length (f) > 0 and a diverging lens with f < 0, depending on the polarization state of the incidental light. To produce a multifocal lens with two focal lengths, a PDF and a converging lens having shorter focal length were combined. In this study, we tested to determine its potential as a new multifocal intraocular lens (IOL).Methods: Constructed a multifocal lens with a PDF lens (f=+/- 100 mm) and a converging lens (f= +50 mm). In an optical bench test, we measured the lens’s focal lengths to test the multifocal function. The multifocal function and optical quality of the lens in various situations were tested. An Early Treatment Diabetic Retinopathy Study (ETDRS) chart as a near target and a parking lot as a distant target were photographed using a digital single-lens reflex (DSLR) camera. Both lenses (multifocal and monofocal) were tested under same conditions. Results: In the optical bench test, the multifocal lens’s focal lengths were 31.2 and 71.2 mm. In the DSLR test using the multifocal lens, the parking lot appeared slightly cloudy compared to the monofocal lens results. With the multifocal lens, the ETDRS chart’s images became blurry as the ETDRS chart’s distance decreased, but became very clear again at a certain position.Conclusions: We confirmed the multifocal function of the multifocal lens using a PDF lens. This lens can be used as a multifocal IOL in the future.

show abstract

“…Although it is the primary complaint of patients with multifocal IOLs, dysphotopsia is only noted in 29% of patients and 95% of patients with otherwise healthy eyes can see with 20/40 vision after cataract surgery and 51% have 20/20 vision. [3] Unfortunately, multifocal contact lenses have faced more issues. It takes multiple days to fit multifocal contact lenses and the success rate of patients sticking with multifocal lenses after 3 months is between 67 and 83 percent.…”

Section: Introductionmentioning

confidence: 99%

Multifocal lens HDR image simulation showing dysphotopsia

Cvarch¹,

Schwiegerling²

2022

Current Developments in Lens Design and Optical Engineering XXIII

View full text Add to dashboard Cite

A system is developed for simulating the image quality and dysphotopsia of multifocal lenses. To achieve this, the simulation modifies a High Dynamic Range (HDR) photograph by blurring it with the lens' point spread function in MATLAB. Dysphotopsias are instances of unwanted or missing light within the eye. Common forms of dysphotopsia include glare, starburst (radial lines emanating from bright sources), and halo (rings of light surrounding bright sources) with the latter two typically occurring at night or in other high contrast settings. Dysphotopsia is considered the most common complaint of patients after successful cataract surgery and have thus earned significant attention in the context of intraocular lenses (IOLs). There have been fewer studies of multifocal contact lens dysphotopsia, but this is despite the documented impact dysphotopsia has on the image quality of multifocal lenses. This simulation is the first handling of dysphotopsia that combines HDR images and specifics of the lens design to predict how the dysphotopsia will appear to patients. Being able to show patients accurate simulations of dysphotopsia has the benefit of setting proper patient expectations before they begin using multifocal lenses. Furthermore, these simulated images can also potentially help diagnose patient problems by giving patients an accurate baseline to compare to.

show abstract

Comparison of two laboratory-based systems for evaluation of halos in intraocular lenses

Cited by 7 publications

References 19 publications

Development of a novel multifocal lens using a polarization directed flat lens: possible candidate for a multifocal intraocular lens

Development of a novel multifocal lens using a polarization directed flat lens: possible candidate for a multifocal intraocular lens

Development of a novel multifocal lens using a polarization directed flat lens: Possible candidate for a multifocal intraocular lens

Multifocal lens HDR image simulation showing dysphotopsia

Contact Info

Product

Resources

About