Table of Contents
What is laser spot magnification?
Spot factor magnification = size of spot at retina / size of setting at laser machine.
What determines spot size of laser?
The spot size depends on the laser wavelength (Eq. 1) with shorter wavelength lasers offering smaller spot sizes and improved spatial resolution.
What is the power of Hruby lens?
Attachment to the microscope is also of advantage with the Hruby lens. The concave contact lens of 64 dioptres is best suited for detailed examination of vitreous and fundus and for measurements.
How do you calculate the diameter of a laser beam?
The beam diameter is simply twice the beam radius, and can be measured anywhere along the propagation axis. The focal spot size can therefore be very small, and when it is, the beam size varies very rapidly along the propagation axis.
What is the minimum value of the spot size of a laser beam?
The radius of the first minimum is given by: 1.22 Wavelength / Numerical_Aperture – approximately equal to the diameter at half maximum intensity. If your first aim is to obtain the smallest spot you can achieve, you may consider about changing your laser wavelength..
What is the Wide field Volk lens?
The digital Wide Field Volk Lens, has an exceptional wide field views and high magnification. It has an enhanced double aspheric design and the multi-layer coating provides high resolution stereo views of the retina with minimal reflections. These unique features make it ideal for general diagnosis and documentation of slit lamp images.
Is the Super field lens included in the review?
1The Super Field lens was not included in this review. It is comparable to the digital wide field lens, but with less glare.
What is the difference between the 28D and digital clear field lenses?
The 28D lens is a classic lens with many strengths. It is comfortable to hold, has great small pupil capability, is suitable for laser, and can be used for neonatal exams. The Digital Clear Field is the new indirect lens in the Digital series.
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