Experimental determination of retinal damages thresholds induced by multiple picosecond laser pulses

Courant, D.; Naudy-Vives, C.; Perot, J.C.; Garcı́a, J.F.; Dormont, Dominique

doi:10.2351/1.521897

Cited by 7 publications

(6 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Also available are the studies by Courant et al 24 who performed an MVL study using 8-ps, 590-nm, laser pulses in a 0.2-second, 1-MHz PRF pulse train. That study did not make a direct comparison with CW exposures.…”

Section: Discussionmentioning

confidence: 98%

“…In order to make the best comparison with published data, we have examined studies with exposure times near the one-quarter second value of our study. 3,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26 Table 3 lists several MVL values that were selected for comparison. The studies were selected based upon exposure duration, retinal image size, wavelength, and subject.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Comparative study of ocular damage thresholds from continuous-wave and femtosecond mode-locked lasers

Thomas¹,

Noojin²,

Stolarski³

et al. 2001

SPIE Proceedings

View full text Add to dashboard Cite

In order to provide a direct comparison of the damage thresholds for mode-locked systems to those with continuous-wave (CW) or non-pulsed output, we have performed an experiment with lasers possessing otherwise identical output characteristics. Our work presents an in-vivo minimal visible lesion (MVL) study. Titanium:Sapphire lasers produced 800-nm output for either mode-locked (76 MHz repetition rate, 120 femtosecond) or continuous-wave exposures. Alternating laser exposures were delivered to the paramacular retinal region of rhesus subjects. Laser exposure duration was set to one-quarter second for both types of exposures. Through ophthalmoscopic examination of the fundus, an MVL threshold for damage is established with probit analysis. Approximately 75 data points for each type of exposure were collected. The laser dosage thresholds and confidence intervals for minimal visible damage at twenty-four hours postexposure are reported for mode-locked and CW exposures. Results are compared with published studies conducted at similar pulse duration and similar CW wavelengths.

show abstract

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Comparative study of ocular damage thresholds from continuous-wave and femtosecond mode-locked lasers

Thomas¹,

Noojin²,

Stolarski³

et al. 2001

SPIE Proceedings

View full text Add to dashboard Cite

show abstract

“…In order to make the best comparison with published data, we have examined studies with exposure times near the one-quarter second value of our study [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34]. Table 4 lists several MVL values that were selected for comparison based upon not only exposure duration, but also retinal image size, wavelength, and species.…”

Section: Discussionmentioning

confidence: 99%

“…Also available are the studies by Courant et al [34] who performed an MVL study using 8-picosecond, 590 nm, laser pulses in a 0.2-second, 1-MHz PRF pulse train. That study did not make a direct comparison with CW exposures.…”

Section: Discussionmentioning

confidence: 99%

A Comparative study of retinal effects from continuous wave and femtosecond mode‐locked lasers

Thomas¹,

Noojin²,

Stolarski³

et al. 2002

Lasers Surg Med

View full text Add to dashboard Cite

show abstract

“…Les premières données expérimentales montraient que les mécanismes de dommage non linéaires ne sont pas influencés par la longueur d'onde, la durée de l'impulsion et la dimension de l'image rétinienne de la même manière que les mécanismes de dommage thermique ou thermo-acoustique. Des études histologiques de grandes et petites plages de rétine, exposées à des impulsions variant de quelques picosecondes à quelques centaines de femtosecondes et à différentes longueurs d'onde, ont montré toutefois que les effets observés sur la rétine sensorielle ont toujours pour origine les granules de mélanine de l'épithé-lium pigmentaire rétinien Courant et al, 1998Courant et al, , 1999a. D'autres études ont permis de tester différents modèles de mécanisme lésionnel basés sur des mécanismes de cavitation et de variation de pression (Cain et al, , 1998Gertsman et al, 1996;Hammer et al, 1997;Strauss et al, 1997 ;Lin et Kelly, 1998 ;Bnnkmann et al, 1999).…”

Section: Les Expositions Subnanosecondes (T < 10-ys)unclassified

Rayonnement laser : risques oculaires et normes de protection

et al. 2000

Self Cite

View full text Add to dashboard Cite

RÉSUMÉLes propriétés optiques des tissus biologiques conditionnent de manière importante le risque d'atteinte par le faisceau laser. Les rayonnementii, émis dans I'ultraviolet mais aussi l'infrarouge B et C, représentent un danger pour le segment anté-rieur de l'oeil. Selon la longueur d'onde, le rayonnement est absorbé préférentiel-lement ou exclusivement par la cornée ou le cristallin. The risk for biological tissues to be damaged by a laser beam is mainly determined by their optical properties. Laser radiations emitted in ultraviolet and infrared B and C represent a hazard for the anterior segment of the eye. Depending the wavelength, laser radiation is absorbed by the cornea, the lem or hotb. The lower damage thresholds are reported at the retinal level, in the spectral range of 400 to 1400 nm. The exposure limit values, recommended by laser safety standards, are evaluated with wavelength, exposure duration, puise repetition frequency and the size of the visual angle subtending the source. The fast evolution of laser producîs induces a continuous revision of guidelines.

show abstract

Experimental determination of retinal damages thresholds induced by multiple picosecond laser pulses

Cited by 7 publications

References 6 publications

Comparative study of ocular damage thresholds from continuous-wave and femtosecond mode-locked lasers

Comparative study of ocular damage thresholds from continuous-wave and femtosecond mode-locked lasers

A Comparative study of retinal effects from continuous wave and femtosecond mode‐locked lasers

Rayonnement laser : risques oculaires et normes de protection

Contact Info

Product

Resources

About