Slit Lamp

Question: Is it okay if I have had 4 slit lamp eye exams in a short time frame? I had two in May a a week apart and one in July andone today which were about 2 weeks apart. Is that damaging to the eye?

Answer: no damage whats ever some people go for s/l examination everyday

Question: does a slit lamp do operations on your eyes? because i am worried a Dr did a operation on me without knowing? i thought it was just to look what was wrong with my eyes but now i am wondering? does a slit lamp have lasers on it that can burn eye tissue? i was sitting in a chair not lying down. im real worried. thanks

Answer: If the instrument was ONLY a slit lamp then, no, the slit lamp itself cannot affect the eye physically. There are surgical procedures that I do while using a slit lamp to observe while I perform the surgery but you would know if the doctor performed one of these procedures. Also, a yag laser employs a slit lamp but it is a totally different instrument that combines a slit lamp with a laser.

Question: 78D or 90D lens with the slit lamp? Is this lens attached with slit lamp or they are hand help lens between eye and slit lamp? To yagman:- My doc did not move as i remember. He moved this small rounded lens around my eye. So, by doing this can he miss any tear if is very far in retina? Is it possible by seeing floater one eye doc can say is it from tear, detachment or they are harmless floaters( from PVD)?

Answer: These are hand held lenses that the doctor uses to visualize the retina. They can be attached to the slit lamp, but are cumbersome and are usually removed because they get in the way when applanating or reaching around. The doctor can visialize tears, detachments, or PVD from this kind of exam, but it is ually standard to use an indirect ophthalmoscope if specifically looking for retinal pathology.

Question: Slit Lamp Examinations...? So, I always freak out during the part of the regular eye exam whenever the eye doctor breaks out the slit lamp. My nerves get the best of me... Can someone please explain to me what actually happens during that part of the exam? Preferably from both the side of the patient and the doctor? I know this sounds silly but, does the slit lamp piece actually touch your eyeball?

Answer: When you go to the eye doctor, and you say that this or that is the problem such as loss of vision, pain, can't see close up, or far away, or to the sides or a combination of symptoms. The 'doctor' finds out how good you see by covering each eye and asking you to see the smallest letter you can see and then possibly use a pinhole to evaluate what the vision is without the need for correction, like nearsighted glasses or astigmatism or farsighted correction. One checks to see if there are problems seeing to the sides to evaluate whether or not there's a brain lesion. The eye movements also evaluate certain nerves. The pupil exam, another set of nerves. Then, when one is through with all the way far away from the person evaluations, one takes a look directly AT the eyes. The 'best' way is to magnify the eyeball and use a light that can be closed into a slit. This allows the light to be used to 'cut' the clear parts with the beam of light. The cornea is transparent. The lens is supposed to be transparent, but if it's not, that's a cataract. How bad a cataract? The slitlamp allows us to evaluate the transparency of those 'clear' tissues or eye organs. Then certain lenses are used to move the focal point back to the back parts of the eye. The optic nerve head is only about 1mm in size. That's 1/25th of an inch. It's little teeny weeny and hard to see without those lenses or the microscope called the slitlamp to allow an evaluation of the nerve fibers, the blood vessels, the nerve fiber layers, the subretinal tissues such as the choroid, the macula, the center of the retina that allows for "good" vision, reading, etc. So the slitlamp is nothing more than a microscope with a certain focal distance attached to a light that can be varied from a round light like a flashlight to a slit that allows precise evaluation of the clear tissues, vessels, retina, nerve fibers, fluid cavities. That's all there is to it. As a patient all one sees is this BRIGHT light, that isn't THAT bright, but sort of is. The slitlamp does not touch the eye and usually doesn't get closer than about 2 inches or so to the ocular surface.

Question: Eye test with Slit lamp after dilation. Need help from an eye doctor.? I have some floater from past two years and go to eye doc regularly. This time my own eye doc was not in office so another eye doc did my eye test. After dilation he used slit lamp and did following tests ( 1 and 2) 1. First he used a very bight light and looked into eye and said you not not have harmful floaters. You have normal floaters Question:-Is it possible to look floater back of the eye like this way? 2. Then he used a small rounded lens between my eye and slit lamp and moved it around my eye and said you do not have tear, detachment Question:-My own doc always asked me look up , down , right , left like this. In this case this doc moved the lens around eye. Did he miss something by not asking me to look up, down , right and left?

Answer: To answer your two questions. 1) Yes. If the doctor used a 78D or 90D lens with the slit lamp, then he would be able to see far enough back into the eye to view floaters. 2) Most doctors ask the patient to move their eyes into the various fields of view (right, left, up, down) because it makes it much easier BUT a doctor could choose to have you hold your eye stationary and then just move his position by looking from your far right, left, up, or down. This would require pretty inconvenient changes in the doctors body position, though.

Question: what was name of machines in arcades with flip pics for a penny a go or the slit pics turning round a lamp.ta? hi was thinking about the machines on the pier from years ago normally had what the butler saw reels, also those other ones which were more like flip pics....consisted of a lamp and shade with slits in it which spun round giving the impression of moving pics.............. think that was called ......atrope any ideas

Answer: A zoetrope was the name of the thing with the slits that spins around.

Question: i want to know about the price of slit lamp and trial box (opthalmology)?

Answer: try these links: http://www.optimetrics.com/cms/ http://www.optimetrics.com/cms/ http://www.reichertoi.com/misc.html?productID=27

Question: Are the eye drops that the optometrist uses prior to an eye exam safe for your eyes? Lately I have been in and out of the eye doctor getting slit-lamp examinations. I have had 3 in a matter of 3 months. Prior to doing so he has dropped yellow eye drops in my eyes. Is the slit-lamp examination bad for your eyes if I have had this many and what about the drops are they harmful? Do they contain thimerosal? I just discovered that certain drops may contain thimerosal. Does this harm your eyes? I am very worried. Can thimerosal cause eye damage?

Answer: Ask your eye doctor if the drops he or she uses during your exams contain thimerosal or not. Some eye drops contain this preservative (it keeps fungi from growing in the solutions over time), but others don't. It can be irritating to some people but not really harmful. And by the way, slit lamp exams are not harmful.

Question: How can i get a service manual for medical devices? Dear friends, Hi, I activate in the field of medical equipment services especially ophthalmic devices. Sometimes I need to have a service manual for a special brand that I don't have it. Please guide me that how I can get a service manual for devices such as slit lamp and ND: YAG lasers? Thank you in advance & best regards mahmood

Answer: Can you contact the manufacturer and order one?

Question: Can anyone help me to construct a better sentences for the below? .Post op follow up of the same experiment on an alternate day basis until day 14 (using confocal, OCT & slit lamp) and ointment application thereafter. it is in a point form and the confocal, OCT and the slit lamp are the machines or big gadgets use to record and take data from that exp. but i notice that if i said that (using confocal, oct and slit lamp) was a big hanging but i also did not want too long sentences. Can anyone help me. Thank you

Answer: This sentence and the style are fine, given the evident context - it's basically a heading or a caption. You're not trying to write Plain English here, after all - you want your target audience to understand and that means using the language they're used to. I don't think it can be improved. "... on an alternate day basis" is "every other day", but that's a British usage. "... thereafter" is useful here, I think. I would perhaps hyphenate Post-op and follow-up to improve clarity.

Question: how can i get a service manual for medical devices? Dear friends, Hi, I activate in the field of medical equipment services especially ophthalmic devices. Sometimes I need to have a service manual for a special brand that I don't have it. Please guide me that how I can get a service manual for devices such as slit lamp and ND: YAG lasers? Thank you in advance & best regards mahmood

Answer: Contact the manufacturer

Question: I would like to make a lamp shade but im not sure what kind of paper to use. does anyone know? i made this lampshade when i was little and would like to try again. we used white paper on the outside and traced a pattern on it. then we used a sharp knife to make small slits on the pattern in various places. then we placed colored paper on the inside so when you turned it on the color showed through the pattern. I am not sure if there is a special paper, if anyone could tell me it would be great.

Answer: You can use parchment paper, rice paper, mulberry paper and any handmade papers. I did this craft in Girl Scouts. If you use handmade papers that have texture, you have to carefully choose where you make the slits because sometimes the pulp, strands or items in the paper are difficult to cut through. Also, it is important not to use a high wattage light bulb because certain papers will yellow from the heat over time. Best to use 40 watts or under. Fun craft, enjoy!

Question: Getting monochromatic light from white light/sunlight & young double slit? I am assuming that sunlight is white light anyway... I'd like to measure the wavelengths of different coloured light in a lamp that emits light similar to that of 'natural sunlight' using Youngs Double Slit Exp To get monochromatic light, that is of the ROYGBIV colours, would I just place a coloured filter in front of the white light source? [and proceed to carry on with the exp as its usually done...] Also, is there a formula or relationship between the intensity of the light and wavelength? And lastly (sorry for the longness), can anyone see how it is possible to incorporate a LDR with the experiment? Thank you sooooo much!!

Answer: The energy of each photon of light is a basic property. It turns out that there is a simple relationship between the energy of a photon and the corresponding wavelength of that photon: E(photon) = (constant) / (wavelength). This simple equation basically ties together the particle and wave nature of light by permitting us to convert back and forth from wavelengths to photons and photons to their corresponding wavelengths. An X-ray photon has a large energy (and a small wavelength) compared with a photon of optical light. Take a look at the following website for some answers to the portion of your question dealing with Young's Double Slit experiment: http://galileoandeinstein.physics.virginia.edu/more_stuff/flashlets/youngexpt4.htm You may need to cut and paste! Dr. H

Question: Can you design an experiment to test the Bohr model of the hydrogen atom? All i have to work with is a Hydrogen vapor lamp, spectrometer (600±3 slits/mm). Also I need to know how to explain why light of different wavelengths is separated by an interference grating. Thanks!

Answer: Read the wiki about diffraction gratings and let me know if you have any questions. http://en.wikipedia.org/wiki/Diffraction_grating The bottom line is that the diffraction grating will separate out the different frequencies of light. The angle at which the light comes out can be related to the frequency or wavelength by a simple formula. The bohr model predicts that electrons orbit the nucleus like a planet orbits the sun. The big assumptions are that: 1) the centripetally accelerating electrons do not radiate (which violates everything we know about electricity and magnetism) and 2) the angular momentum is quantized--it only comes in bite size pieces. L = n h-bar, where n is an integer and h-bar is this teeny, tiny amount of angular momentum From that, you can fairly easily work out that only certain energy levels are allowed: E(n) = - 13.6 eV / n^2 Hydrogen radiates when an electron jumps from a higher level to a lower one and releases an energy: deltaE = E(nf) - E(ni) = 13.6 eV (1/nf^2 - ni^2) which goes to a photon with that same energy = hf = hc / lambda So you only get certain wavelengths. Tou can work out all the possibilites and get the lyman series and the balmer series and all that. And when you shine the light on the diffraction grating, you will in fact find those lines in those series. If you want a test the Bohr model will fail, there are a couple things you can do. If you have really, really good equipment, you can look really really closely at the spectral lines and find that some of them are split. The Bohr model doesn't account for this fine structure. Another thing you can do is run the experiment in the presence of a very strong magnetic or electric field. The spectral lines will be split by the Zeeman or Starke effects, which also can't be explained by the Bohr model. And of course, the Bohr model was never successfully extended to atoms with more than one electron.

Question: Calculation for wavelength of sodium light using a double slit interferometer? Hey, need to write up a report for an experiment to calculate the wavelength of an impure sodium lamp using a yound's double slit interferometer. I'm a bit confused about my results, mainly this part: Found the zero order bright interference pattern to be at 0.11mm, have then wound it over until the third bright interference pattern. When calculating the average do i divide by 3 or 4? Here is what is on my sheet. 0)-0.11mm 1) 2) 3)-4.5mm so when calculating the average fringe width do i divide by 3 or 4? Subbing the values into the formula wavelength=((fringe width)(distance between slits))/Length of interferometer Where d=0.25mm or 2.5x10^-4 (i'm not sure if that sound correct), L=0.6m and fringe width =(4.5-.11)/4 i get a value of 4.57x10^9m...does that sound near what it could be? Remembering it is an impure lamp.

Answer: 4.57 * 10^-9 (457 nm) is in the right ball park, the more accurate result should be around 589.3nm or 5.893 * 10^-9 m. If your lamp is impure and you will also have some measurement errors in there, but you are about 20% inaccurate - which isn't too bad in this case.

Question: What kind of neat things can I make by wire welding? My hubby is teaching me how to weld and he is starting me off on wire welding first. I love it! I welded a bunch of stuff together, practicing on my tacking and the bead. He took what I welded and hung it from the porch. He welded me a hanging lamp made out of round saw blades, It really looks good and everybody likes it but won't sit underneath it. hahaha I'm making a piggy bank. It is just 4 sides and a top with a slit for $$ and a bottom. The only way to get it open is to torch it. But I was thinkin' on putting some flower petals on it...ect. something like that. C'mon now...... I know that there are a bunch of you out there that has allot of ideas to do. ~wink~

Answer: Make art, baby, make art! Remember that mouse in the museum story (old children's book)? He made sculptures with whatever wire and other things he found. Do some awesome stuff; you'll know what to do once you get started. It will kinda flow from you.

Question: What will happen to double slit interference if there were polarizers present? http://img254.imageshack.us/img254/1646/pola.gif A double slit plate is illuminated by a point source of monochromatic, un-polarized light. But unlike in vanilla double slit interference there are three polarizing plates. Circular clockwise polarizer (1) and counter-clockwise polarizer (2) are placed in front front of the slits. The third large polarizer (3) is linear and placed behind the slits. In this scheme of things there is no interference pattern on the screen. Here is why: the source emits even mix of cw and ccw polarizations: Ψ = A |cw> + B |ccw>. These two amplitudes A and B are uncorrelated thus the lamp acts effectively as two separate sources of cw and ccw light, the light from each source passes through its own slit and they DO interfere after the third polarizer makes them straight, but each photon interfere with itself at random phase shift A/B and thus there is no observable pattern on the screen. The question : where and what kind of polarizer must be placed to restore cos²(kx) interference pattern? I agree with Vašek. In fact the forth linear polarizer placed in front of all others helps to explain why there is no observable pattern in its absence. Namely if we rotate the orientation of the fourth polrizer by 90 degress, which is full 180 degrees of longitude on the Poincare sphere, the corresponding interference pattern will shift by 180 degrees of phase on the screen. This is how in the absence of the fourth polarizer horizonal and vertical polarizations emitted by the unpolarized source kill each other by producing two patterns excactly in counter-phase to each other.

Answer: Any linear polarizer placed before the circular polarizers would do the work. That is because the light is no more unpolarized after passing it, changing the assumption that was the cause of decoherence after the splitting to the two orthogonal polarization states. The polarization state after passing through the linear polarizer is pure, so that by projecting it on the two circular states, their amplitudes are inherently correlated. Mistress Bekki: As far as I understand, the trick is that the incoming light in the original setup is unpolarized, thus its polarization state can't be written as any linear combination of |x> and |y>. It's the maximum entropy mixed state described by a density matrix ρ = 1/2*I instead, which can be viewed _for example_ as a photon coming in the state |x> with probability 50% and in |y> with probability 50%. This indeed ruins the interference pattern completely. We need to "stabilize" this to 100%:0% (in any basis), which is done by a 1D orthogonal projector. Mistress Bekki: It's the order that matters.

Question: Interference Young's double-slit? Yellow-orange light from a sodium lamp of wavelength 596 nm is aimed at two slits separated by 1.98 10-5 m. What is the distance from the central line to the first-order yellow line if the screen is 0.570 m from the slits?

Answer: (Wavelength x Distance)/Slit Spacing = Fringe (Line) Separation. (596x10^-9m x 0.57m)/1.98x10^-5m = 0.017m = 1.7cm.

Question: Punctate staining. Anyone know what this is? Hi I went for a lasik consultation along with my daughter. Later on I called to ask about Dry Eyes and if either myself or my daughter seems predisposed to the problem. They told me that they checked us both for punctate staining during the slit lamp exam and both of us are fine. Does anyone know what punctate staining is? Also what a slit lamp exam is?

Answer: A slit lamp is the microscope that they look at your eye with. For much of the exam, the beam of light is narrowed down to a slit. The proper name for this device is bio-microscope but it is often called a slit lamp. Part of the exam involves putting flourescein in your eye. This is usually done by touching a paper to your eye that has yellow stuff on it. This is very special yellow stuff. It glows when you shine a black light on it. It absorbs into your eye where the top layer of tissue is not completely intact. If you look at a persons eyes with a slit lamp after you have put flourescein in their eyes, you can get some information about the quality of their tears. First of all their tears will glow if you have the black light filter in. This allows you to see how many tears they have. It also allows you to see how long it takes for the tears to break up. Punctate staining would mean that there were small spots where the stain absorbed into the cornea, This would mean that the cornea was damaged. This would usually indicate fairly severe dry eye. I would not consider absence of punctate stain to be very good assurance that you will not have dry eyes after LASIK.

Question: double-slit interference? A pair of narrow, parallel slits seperated by 0.25 nm are illuminated by the green component from a mercury vapor lamp( lambda= 546.1 nm). The interference pattern is observed on a screen 1.20 m from the plane of the parallel slits. Calculate the distsance from the central maximum to the first bright region on either side of the central maximum and between the first and second dark bands in the interference pattern.

Answer: Use the equation mλ=d∆y/L Where m=fringe number λ=wavelength d=slip separation ∆y=distance from center to fringe L=distance from slits to screen Although this is nonstandard, I use m=1/2 for the first order dark band and m=3/2 for the second. I think this is better than having two equations, one for bright and one for dark.