A Story from the Field: The First Morning Back

Natthida is a thirty-eight-year-old optometrist who runs a small optical shop and eye exam room in a two-unit shophouse not far from the Tha Chin River in Mueang Suphan Buri. The business belongs to her family. Her father started it decades ago, repairing glasses and replacing lenses for neighbors, and when Natthida finished her studies she came home and added a modern exam room with an autorefractor, a trial lens set and a proper exam chair. Her customers are a familiar mix for a provincial town: older residents who have been coming for years, schoolchildren sent by their teachers for a vision check, and office workers who stare at screens all day and wonder why their eyes feel tired by mid-afternoon.

This year the Tha Chin spilled over and pushed water about forty centimeters deep into the street in front of the shop. It stayed for almost a week. Natthida and her father managed to carry many boxes of lenses upstairs and lift the autorefractor onto a high table. But the lowest display cabinets, a case of trial lenses, the customer chairs and the carpet in front of the counter were all at the height the water reached. There was simply not enough time, or enough hands, to move everything.

On the morning the water finally drained away, she unlocked the rolling shutter and pushed it up. The first thing that hit her was not what she saw but what she smelled: a heavy, damp, muddy odor that rolled out of the shop the moment the air moved. A thin film of silt traced a tide line across the floor tiles. The lower glass of the display cabinets had a cloudy haze on the inside. When she pulled open the drawer of spare frames, she found grey-green spots on several plastic frames, and the lens-cleaning cloths stored together in a cardboard box were damp and sour.

Two days later, after a long round of mopping and wiping, a regular customer came in to collect the glasses she had ordered before the flood. She sat down to wait, and within five minutes she was sneezing again and again. Then she said, kindly but clearly, "Dear, the shop still smells like the flood." That one sentence told Natthida everything. Wiping surfaces until they looked clean was not enough for a business where customers sit close to the equipment, try frames that touch their faces, and rest their chins on instruments.

Why Optical Shops Need More Care After a Flood Than Ordinary Retail

An optical shop sells products that touch the face directly. In a single visit, a customer may pick up and try on dozens of frames. The temples rest behind the ears, the nose pads sit on the bridge of the nose, and the customer looks at themselves in a mirror at close range. Many customers are elderly or are children, groups whose immune systems are not as robust as those of healthy working adults. That alone sets an optical shop apart from, say, a hardware store or a phone accessory stall.

The exam room adds another layer. Most exam rooms are small, closed spaces with low light, the air conditioner running all day, and often no window at all. These rooms are designed to be dim so that the optometrist can test vision accurately, but dim, cool, enclosed spaces are exactly where moisture lingers after a flood. If the walls absorbed water, the humidity in the room may stay high for weeks, and mold will find every opportunity to grow.

The common risk points we see in optical shops and eye exam clinics after floodwater recedes include:

• Display cabinets and frame drawers. The bases of many cabinets are made of plywood or particle board, which soak up water, swell, and become hidden breeding grounds for mold that cannot be seen from the outside.
• Plastic and acetate frames. These have small hinges, joints and textured surfaces where moisture gets trapped, leading to stains and a stale smell.
• Silicone or rubber nose pads and temple tips. These touch the skin directly and are sensitive both to moisture and to some chemicals.
• Trial lens sets and trial frames. They are used on every customer. If the case was stored low, it may have been exposed to humidity or silt.
• Exam chairs, chin rests and forehead rests. These are points where a customer's face makes direct contact.
• Carpets, curtains and gypsum walls. These absorb water and hold odors for a long time, so the shop keeps smelling musty even after the floor is dry.
• Air conditioning units and ducts. Switching the air conditioner on too early in a damp room can blow mold spores throughout the exam area and the sales floor.

The Risks That Follow: Health, Reputation and Revenue

Health. Floodwater that flows through town streets is rarely just rainwater. It often carries sewage, waste and debris, and it passes through places where rats and other animals live. Dried silt left on floors and table legs can harbor bacteria associated with diarrheal illness. Areas where rodents have moved through carry a risk of leptospirosis, which is a particular concern for staff who clean up by hand without boots and gloves. Mold growing on walls and wooden cabinets can trigger allergies, sneezing, a blocked nose, eye irritation and asthma. For a business whose customers walk in because they already have concerns about their eyes, itchy or red eyes caused by mold spores in the air are the last thing anyone wants to happen inside the shop.

Reputation. An optical shop sells precision and care. Customers trust the optometrist to measure their eyes accurately and to recommend lenses that will serve them for years. If a customer walks in and notices a musty odor, or sees a spot of mold on a frame they are handed to try, that trust disappears in seconds. In a mid-sized provincial city like Suphan Buri, word spreads quickly through community and parent LINE groups. A comment like "that shop still smells of the flood" can travel further than any advertisement.

Revenue and time. Every day the shop stays closed is a day when customers who ordered glasses before the flood cannot collect them, and when new customers may choose another shop that reopened sooner. The longer the reopening is delayed, the more time the owner spends calling customers, explaining delays and rescheduling appointments. Restoring the shop systematically from the start usually allows a faster and more confident reopening than fixing one problem after another over several weeks.

There is also a hidden cost in staff wellbeing. Employees who spend their days in a damp, musty room may develop headaches, sore throats or allergy symptoms. They may not complain openly, but their energy and patience with customers suffer. A shop that feels fresh and clean is easier to work in and easier to sell in.

Why the Usual Fixes Fall Short

After a flood, shop owners understandably reach for whatever is at hand. The problem is that many common methods solve only part of the problem, and some create new ones.

• Pouring bleach everywhere. Bleach can help on hard, non-porous surfaces after the silt has been washed away. But its fumes are harsh on the eyes and airways, it can tarnish or corrode metal frame parts and instrument components, and it does not penetrate the swollen plywood inside a cabinet where mold is actually growing.
• Running fans for days. Fans help surfaces dry, which is good. However, they can also stir up mold spores and spread them onto cabinets and stock that were still clean.
• Air fresheners and scented candles. These mask the smell for a few hours, but the odor molecules and the microorganisms causing them remain. Strong fragrances can also make sensitive customers feel dizzy or trigger headaches, which is not ideal in a room where people are trying to read an eye chart.
• Painting over mold stains. Fresh paint makes a wall look new, but if the wall is still damp inside, mold will push the paint into bubbles and reappear within a few weeks.
• Wiping exam equipment with an ordinary damp cloth and cleaner. Electronic devices and the optics inside them are sensitive to moisture and chemicals. Cleaning them the wrong way can cause more damage than the flood did. Have a technician or the manufacturer's representative inspect them first.

What the shop really needs is a sequence: remove what is damaged, clean off the silt, disinfect thoroughly into every corner, and then deal with the odor and the mold spores floating in the air before customers come back.

The Solution: CHEMGENE HLD4H Disinfection Fogging Plus Controlled Ozone Treatment

World Health Disinfection (WHD) restores flood-affected spaces with two complementary steps.

1. Disinfection fogging service. We apply CHEMGENE HLD4H disinfectant through ULV (ultra-low volume) equipment, which turns the solution into a very fine mist. The mist drifts behind display cabinets, under the counter, into the corners of the exam room and into gaps that a cloth simply cannot reach. It covers the surfaces of the shop far more evenly than wiping by hand.

2. Ozone treatment service. Using a professional ozone generator in a sealed room, we fill the space with ozone gas. Because it is a gas, ozone reaches the whole volume of the room. It helps deal with mold spores in the air and on surfaces, and it breaks down the molecules responsible for musty, muddy and drain-like odors. The smell is removed at its source rather than being covered up.

Special precautions for optical shops. Autorefractors, slit lamps, computers and lens edgers should be removed or completely covered before fogging and ozone treatment. Our team adjusts the ozone dose to the size of the room and the materials present. Stock that contains rubber or silicone, such as spare nose pads or frames with rubber parts, should be packed in closed boxes or moved out temporarily. Instruments that touch the eye directly must still be cleaned and disinfected according to professional standards and the manufacturer's instructions, exactly as before. WHD's service takes care of the space and the air in the shop; it does not replace those clinical steps.

How the WHD Team Works in an Optical Shop and Exam Room

1. Site survey. We look at how high the water reached, where mold is visible, and the state of the exam room, stock room, restroom and air conditioning. We ask which instruments need to be moved or covered.
2. Clean-up advice before fogging. We recommend removing wet carpets, curtains and cardboard boxes, washing silt off the floor, and separating damaged stock from stock that can still be sold.
3. Preparing the space. Electronic instruments are moved or covered, sealed lens stock is packed away, and products with rubber parts are placed in closed boxes.
4. ULV disinfection fogging. CHEMGENE HLD4H is applied throughout the space: floors, lower walls, the insides of emptied display cabinets, under counters and in the restroom.
5. Sealed-room ozone treatment. Doors and windows are closed, and the dose and duration are set to the room size. No people, pets or plants may be inside during treatment.
6. Ventilation. After the cycle, doors and windows are opened and exhaust fans are run until the air is fresh before staff go back in.
7. Odor and risk-point re-check. We walk through the shop with the owner. If any area still smells, such as a back stock room, we can plan a targeted second treatment.

For day-to-day care after reopening, the CHEMGENE HLD4H spray is convenient for wiping counters, bag shelves and door handles between customers.

Frames and Lens Stock: Keep, Repair, or Remove?

The question optical shop owners ask most often after a flood is whether stock exposed to moisture can still be sold. There is no single answer for every item, but these general guidelines make the decision easier.

• Metal and titanium frames that were exposed to humidity but not submerged. These can usually be cleaned. Check the hinges and screws for rust, and replace the nose pads.
• Plastic or acetate frames with clearly visible mold spots. Set these aside for assessment by someone who knows the product. If the stain has penetrated the material or the frame shows swelling, do not hand it to customers to try on.
• Lens stock whose outer boxes got wet. Check whether the inner packaging is still fully sealed, and ask your supplier for guidance.
• Products that contact the eye, such as contact lens solution or contact lenses whose packaging was in floodwater. These should be discarded in line with manufacturer and regulatory guidance. Do not take the risk of selling them.
• Lens cloths, glasses cases and cardboard boxes. Each item is cheap, but they hold odors and microorganisms very well. Throwing them away is almost always more sensible than trying to wash them.

Once sorting is done, disinfecting the storage area and treating the stock room with ozone helps make sure that the good stock does not pick up a musty smell or mold spores from the shelves where it was kept.

A Practical Reopening Timeline for the Shop

Every shop is different, but many owners find it helpful to think about recovery in stages rather than trying to do everything at once.

• Day one to two after the water drains. Photograph the damage for insurance and records. Remove wet carpets, curtains and cardboard. Wash off silt with boots and gloves on. Open doors to let air move, but avoid switching on the air conditioner yet.
• Day two to four. Sort stock into "keep", "assess" and "discard". Arrange for a technician to check exam instruments and the lens edger. Contact your suppliers about wet lens stock.
• Day three to six. Book disinfection fogging and ozone treatment once the heavy cleaning is done. This is also the right time to have the air conditioner cleaned by a technician, so that you do not reintroduce spores from the coils.
• Before reopening. Put clean stock back on disinfected shelves, replace nose pads on display frames, and do a final walk-through with fresh eyes and a fresh nose. If anything still smells, deal with it before customers arrive.
• The first weeks after reopening. Keep an eye on corners, the base of cabinets and the exam room walls. If you notice new spots or the smell returning, it often means a hidden source of moisture remains.

10 Reasons Optical Shops in Mueang Suphan Buri Choose WHD

1. We use CHEMGENE HLD4H disinfectant, designed for surface disinfection.
2. ULV fogging through our disinfection service reaches behind display cases and under counters.
3. Ozone treatment breaks down musty odor at the source instead of masking it.
4. The ozone dose is adjusted to the size of the exam room and the stock room.
5. We plan which exam instruments and electronics to cover or move before we start.
6. We advise on sorting damaged stock before fogging so the results are as good as possible.
7. Work can be scheduled outside opening hours to minimize disruption to customers.
8. We offer ozone treatment for odors and chemical residue after repainting or new flooring.
9. Our dust mite removal service can care for fabric sofas and chairs in the waiting area.
10. Our mosquito spraying service covers the area around the building, since mosquitoes often increase after floods.

Before and After Restoration

Customer Voice (Example Scenario)

"At first I thought mopping, wiping the cabinets and running the air conditioner to dry things out would be enough, but the smell would not go away. The team helped me plan which machines to move and what to pack, and they worked in the evening after we closed. The next morning the shop smelled completely different. The regular customer who had been sneezing could wait for her glasses comfortably."

— Natthida, optical shop owner, Mueang Suphan Buri (example scenario)

Frequently Asked Questions

Q: Will ozone damage frames or lenses?
A: High concentrations of ozone can affect rubber, silicone and some plastics with prolonged exposure. That is why we recommend packing stock in closed boxes or moving it out, and why we control the dose to suit the space.

Q: Do I need to remove my autorefractor?
A: We recommend moving it out or covering it completely, and having a technician or the manufacturer's representative inspect it if it was exposed to moisture before you use it with customers.

Q: How long does the whole process take?
A: It depends on the size of the shop and the extent of damage. A one- or two-unit shop is often completed within one working day including ventilation time, and we can schedule outside opening hours.

Q: When can staff go back in after ozone treatment?
A: After the treatment cycle, the space must be ventilated until the air is fresh. Our team will tell you the appropriate time on the day.

Q: Do I need to remove carpets and gypsum boards first?
A: If the carpet was submerged or the gypsum is swollen and soft, it should be removed first because these materials hold moisture inside. Fogging and ozone work best after the source of moisture is gone.

Q: Can this service replace the standard disinfection of eye exam instruments?
A: No. WHD's service treats the space and the air in the shop. Instruments that contact the eye must still be handled according to professional standards and the manufacturer's instructions.

Q: My shop is outside the town center. Can you still help?
A: Contact us by phone or LINE to confirm the service area, and our team will share details and available dates.

Reopen Your Optical Shop with Confidence

Let the WHD team help you plan the recovery of your optical shop and eye exam room, from the first survey to the final odor check.

See Our Disinfection Service – Click Here

Book Ozone Treatment – Click Here

Call 065-556-6294 · LINE @whd268 · Email worldhealthdisinfection@gmail.com

Related Links

• Residential ozone disinfection
• Ozone treatment for odors and chemical residue
• CHEMGENE HLD4H disinfectant spray
• All articles

Health reference: World Health Organization (WHO): Floods · Department of Disease Control, Thailand