Cortical adaptation and visual enhancement

Zalevsky, Zeev; Yaish, Shai Ben; Zlotnik, Alex; Yehezkel, Oren; Belkin, Michael

doi:10.1364/ol.35.003066

Cited by 4 publications

(6 citation statements)

References 9 publications

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“…Rather than manipulating the distribution of light amplitude across the lens, it appears to be more promising to alter the phase distribution. Zalaevsky and his colleagues have recently demonstrated a soft contact lens in which a binary profile is engraved on the lens surface, the pattern being described as ‘ two annular rings with widths of a few hundred microns each and a … depth of less than 700 nm’ . This is designed to produce a focus which extends over about 3 D as a result of the constructive interference of light from different zones of the lens.…”

Section: Contact Lensesmentioning

confidence: 99%

“…There is no loss of light, astigmatism is masked, and, unlike diffractive lenses, there is no abnormal longitudinal chromatic aberration. Good visual results are claimed, it being suggested that blur adaptation plays a role in the interpretation of the images . What is not clear is the sensitivity of the performance of these lenses to the diameter of the eye pupil, or the extent to which the loss in image contrast implicit in the method would be tolerated by patients.…”

Section: Contact Lensesmentioning

confidence: 99%

“…Zalaevsky and his colleagues have recently demonstrated a soft contact lens in which a binary profile is engraved on the lens surface, the pattern being described as 'two annular rings with widths of a few hundred microns each and a … depth of less than 700 nm'. 143,144 This is designed to produce a focus which extends over about 3 D as a result of the constructive interference of light from different zones of the lens. There is no loss of light, astigmatism is masked, and, unlike diffractive lenses, there is no abnormal longitudinal chromatic aberration.…”

Section: Other Possibilitiesmentioning

confidence: 99%

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Developments in the correction of presbyopia I: spectacle and contact lenses

Charman

2013

Ophthalmic Physiologic Optic

147

136

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Purpose: To outline the refractive problems associated with presbyopia and to review the basis and relative merits of currently-available methods for their correction, with detailed consideration of spectacle and contact lens approaches. Contents: In the developed world, most of the present population will spend roughly half their lives as presbyopes. The well-known presbyopic changes with age in amplitude of accommodation and required near addition are briefly reviewed, together with the less widely acknowledged slow drifts that occur in distance refraction. The desirability of restoring to presbyopes clear vision for objects at any distance, ideally corresponding to vergences within the range of at least 0 to À5 D, in any viewing direction, is stressed. A general outline is given of possible corrective methods. Methods which satisfy the needs of a 50 year-old may not be suitable for the 80 year-old. Corrections may involve both fixed-and variablefocus lens systems, and surgical methods which modify the optics of the cornea, replace the crystalline lens with different fixed optics, or attempt to at least partially restore active accommodation. Some more recent methods of spectacle and contact lens correction are described in more detail. Particular attention is given to recent commercially-developed spectacles in which the corrective power can be varied actively by either mechanical (liquid-filled deformable lenses or Alvarez lenses) or electrical (liquid crystal lenses) means to allow objects at different distances to be seen clearly. Contact lens corrections show less progress and are still preferred only by a minority of older patients, most of whom are early presbyopes. Summary: The rising proportion of presbyopes in the population, covering an age span of around 40 years, represents both a problem for those concerned with giving their patients the best vision possible at both far and near viewing distances and a commercial opportunity. Traditional single-vision distance and near, bifocal, and progressive spectacle lens solutions, together with contact lens modalities for presbyopic correction, are being challenged by a variety of new approaches. It remains to be seen whether the latter will receive wide acceptance in practice.

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Section: Contact Lensesmentioning

confidence: 99%

Section: Contact Lensesmentioning

confidence: 99%

Section: Other Possibilitiesmentioning

confidence: 99%

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Developments in the correction of presbyopia I: spectacle and contact lenses

Charman

2013

Ophthalmic Physiologic Optic

147

136

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“…It is a natural consequence of the lack of rotational symmetry in the LSL shape, which causes the focusing of light into the off-axis direction perpendicular to the actual focusing angular segment [12]. The ability of the human visual system to adapt to this situation remains to be investigated, with some studies indicating high flexibility [27,28].…”

mentioning

confidence: 99%

Assessment of imaging with extended depth-of-field by means of the light sword lens in terms of visual acuity scale

Kakarenko

Ducin

Grabowiecki

et al. 2015

Biomed. Opt. Express

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Abstract:We present outcomes of an imaging experiment using the refractive light sword lens (LSL) as a contact lens in an optical system that serves as a simplified model of the presbyopic eye. The results show that the LSL produces significant improvements in visual acuity of the simplified presbyopic eye model over a wide range of defocus. Therefore, this element can be an interesting alternative for the multifocal contact and intraocular lenses currently used in ophthalmology. The second part of the article discusses possible modifications of the LSL profile in order to render it more suitable for fabrication and ophthalmological applications.

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“…Bunun için görme sisteminin kontrast adaptasyonu ve görmedeki farklı çizgilerden ahenkli ve devamlı bir görme alanı yaratabilme kapasitesinden faydalanılmıştır. 36 İnsan gözü monofokal bir sistemdir. Yakındaki nesneleri netlerken uyum (akomodasyon) ile gerekli kırıcılık değişikliğini oluşturur.…”

Section: Nöroadaptasyona Başka öRneklerunclassified

Yapay Görme, Yeni Görme Modaliteleri ve Nöroadaptasyon

Or¹

2012

tjo

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Ge lifl Ta ri hi/Re cei ved: 18.02.2011 Ka bul Ta ri hi/Ac cep ted: 28.06.2011 ÖzetYapay görmenin oluştuğu tanımları incelemek, göz ameliyatları ve hastalıklar ile oluşan yeni görme modalitelerini irdelemek ve yapay görme tanım sistemlerinin görme algısını artırıcı tedavilerde ve nöroadaptasyonu anlamada kullanımını fark etmek.Görmenin ne olduğunu fen bilimleri bugüne kadar tam olarak tanımlayamamıştır. Ancak görmenin oluşmasındaki bazı etkenler göz önüne alınarak bazı optik temelli sistemler ve tanımlamalar oluşturulmuştur.Bu tanımlamaların en bilineni kenar algısı üzerinden çalışan görme algısını en iyi betimleyen sistem olan Gabor filtresi ve yamasıdır. Bu sistemler bugün endüstri ve teknikte makinelerin, robotların ve bilgisayarların "görme"leri için kullanılmaktadır. Bu tanımlamalar makineler yanında, insanlarda bazı göz ameliyatları sonrasında oluşan ve doğada olmayan yeni görme modalitelerine nöroadaptasyonun anlaşılması için veya var olan görme modalitelerinin kalitesinin tanımlanması için kullanılmaktadır. Gabor sistemi ile oluşturulan ve görme algısını uyaran yeni tedavi sistemleri geliştirilmiştir. Ayrıca 35 sene öncesine kadar var olduğu bilinmeyen "kör görme" bugün görsel egsersizler ile uyarılabilmektedir.Gabor sistemi görsel algının hem yapay görme, hem de insan görmesinde tanımlanabilir bir tasviridir. Bu sistem bugün robot görmesi için kullanılmaktadır. Göz ameliyatlarından sonra veya görsel optik gereçler kullanımı ile oluşan yeni görme modaliteleri vardır. Ayrıca kör görme nedeni tam olarak bilinmese de tanımlanmaya başlayan farklı bir görme çeşididir. Gabor sistemi kullanılarak tüm yeni görme modalitelerinde görmeyi uyarıcı tedavi uygulanabilmektedir. (Turk J Oph thal mol 2012; 42: 61-5) Anah tar Ke li me ler: Yapay görme, yeni görme modaliteleri, nöroadaptasyon

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Cortical adaptation and visual enhancement

Cited by 4 publications

References 9 publications

Developments in the correction of presbyopia I: spectacle and contact lenses

Developments in the correction of presbyopia I: spectacle and contact lenses

Assessment of imaging with extended depth-of-field by means of the light sword lens in terms of visual acuity scale

Yapay Görme, Yeni Görme Modaliteleri ve Nöroadaptasyon

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